Rubber in a car fails in specific places: weatherstripping that no longer seals, a gasket that weeps, a trim piece that lifts at speed, and a hose connection that seeps. The adhesive that fixes one of those jobs can ruin another, because silicone sealants, gasket makers and weatherstrip adhesives cure differently and tolerate different temperatures. This guide compares five Permatex adhesives for rubber-adjacent automotive jobs, and it is filed in our automotive adhesives archive. Read the maker use list before buying, because the wrong adhesive on the wrong rubber is a second repair.
How we researched this guide
We compared five automotive adhesives for rubber work with maker pages, retailer listings and technical sheets: Permatex 81158 Black Silicone, Permatex 80050 Clear RTV, Permatex 81422 High-Temp RTV, Permatex Ultra Black Gasket Maker and Permatex 81850 Weatherstrip Adhesive. We checked eight maker and retailer documents, including the Permatex 81158 listing and manual pages, the Permatex 80050 listing and the Permatex 81422 listing, and we printed temperature ranges and cure times exactly as the sources state them.
We reviewed ten owner, forum and retailer sources, including Permatex technical pages and retailer listings for all five products. We do not buy or bench-test adhesives; every figure below is maker- or listing-documented, and every owner point is paraphrased with a link to its source. Where a maker stays silent, you will read Not published instead of a guess.
The 30-second answer
For most rubber sealing and weatherstrip work, buy the Permatex 81158 Black Silicone Adhesive Sealant first: a general-purpose black RTV for weatherstripping, vinyl tops and seams. For a clear finish, take the Permatex 80050 Clear RTV Silicone Adhesive Sealant. For high-temperature gasket work, take the Permatex 81422 Sensor-Safe High-Temp RTV. For oil-resistant gasket making, the Permatex Ultra Black Gasket Maker is the pick, bought through its written alternative below. For dedicated weatherstrip bonding, the Permatex 81850 Weatherstrip Adhesive is the pick, also through its written alternative below.
Best Overall
Permatex 81158 Black Silicone Adhesive Sealant
Best if you do general rubber sealing: a black RTV for weatherstripping, vinyl tops, seams and wiring protection.
Best Clear Finish
Permatex 80050 Clear RTV Silicone Adhesive Sealant
Best if the repair is visible: a clear, sensor-safe RTV for glass edges, light trim and seams.
Best High-Temp Gasket Maker
Permatex 81422 Sensor-Safe High-Temp RTV Silicone Gasket Maker
Best if the gasket runs hot: a sensor-safe high-temp RTV for engine gasket making.
Best Oil-Resistant Gasket Maker
Permatex Ultra Black Gasket Maker
Best if oil exposure is the problem: an oil-resistant gasket maker for pans, covers and gearboxes.
Alternative with link: Permatex 81158 Black Silicone Adhesive Sealant — a general-purpose black RTV for weatherstripping and seams, as a fallback where oil resistance is not decisive The button below buys the alternative, not the headline part.
Best Weatherstrip Bonding
Permatex 81850 Weatherstrip Adhesive
Best if the job is bonding stripping itself: a dedicated weatherstrip adhesive, not a general sealant.
Alternative with link: Permatex 81158 Black Silicone Adhesive Sealant — a general-purpose black RTV that seals weatherstripping well, as a fallback where bonding strength is not decisive The button below buys the alternative, not the headline part.
Quick comparison
| Product | Key spec | Best for | Check Price |
|---|---|---|---|
| Permatex 81158 Black Silicone Adhesive Sealant | Black RTV, 3 oz | Weatherstripping and seams | Check Price |
| Permatex 80050 Clear RTV Silicone Adhesive Sealant | Clear RTV, 3 oz | Visible seams and light trim | Check Price |
| Permatex 81422 Sensor-Safe High-Temp RTV Silicone Gasket Maker | High-temp RTV gasket maker, 3 oz | Hot engine gaskets | Check Price |
| Permatex Ultra Black Gasket Maker | Oil-resistant gasket maker | Oil-exposed flanges | Check Price |
| Permatex 81850 Weatherstrip Adhesive | Weatherstrip adhesive | Bonding stripping and trim | Check Price |
Adhesive finder: match the adhesive to your rubber job
Enter the highest temperature your repair will see, in degrees Fahrenheit, and this finder recommends a pick from this guide, with its button. It is a rough starting point only: always check the maker use list, because temperature alone never proves an adhesive suits your rubber or substrate.
How to choose an automotive adhesive for rubber
Rubber type and substrate first
Name both surfaces before choosing: EPDM weatherstripping, nitrile hose rubber, vinyl trim and painted metal each pair with different chemistry. Silicone RTV suits weatherstripping and vinyl tops, while gasket makers suit flange sealing. An adhesive that bonds vinyl beautifully may not bond EPDM at all, so read the maker use list for your exact pair.
Temperature range
Check the highest temperature the repair will actually see, not the average: exhaust-adjacent gaskets run far hotter than door seals. Permatex 81158 lists a range of minus 75 to 450 degrees Fahrenheit, while the clear 80050 lists minus 75 to 400 degrees. Buy the range that covers your worst case, not your typical case.
Cure time and handling
RTV sealants need time to skin and cure, and the 81158 lists a 24 hour full cure. Plan the job so the bonded part is not stressed, washed or driven hard before it cures, because early stress breaks the bond before it forms. If the vehicle must return to service fast, a faster-curing product or a mechanical fix suits better.
Sensor safety and oil resistance
Near oxygen sensors, use a sensor-safe RTV like the 81422, because some sealants damage sensors as they cure. For oil-exposed gaskets, use an oil-resistant gasket maker like Ultra Black, because a general sealant softens in oil. The job location decides the chemistry, not the tube you already own.
Colour and visibility
Black RTV disappears on black weatherstripping and trim, while clear RTV suits visible seams on light trim and glass edges. Colour is not cosmetic vanity: a visible repair that looks wrong gets redone, and a redone repair costs more than the right tube did. Match colour to the visible surface.
Removability and future service
Some adhesives are meant to be permanent, while gasket makers are meant to be cut away at the next service. If the part will be removed again, choose a product that releases cleanly with a scraper, and avoid permanent bonding on service parts. Future you will thank present you for that choice.
Automotive adhesive data at a glance
| Item | Maker-stated figure | Source |
|---|---|---|
| Permatex 81158 | Black RTV, minus 75 to 450 degrees Fahrenheit, 24 hour full cure, 3 oz | Permatex 81158 listing |
| Permatex 80050 | Clear RTV, minus 75 to 400 degrees Fahrenheit, 3 oz | Permatex 80050 listing |
| Permatex 81422 | Sensor-safe high-temp RTV, 3 oz | Permatex 81422 listing |
| Permatex Ultra Black | Oil-resistant gasket maker, per Permatex range | Permatex range coverage |
| Permatex 81850 | Weatherstrip adhesive, per Permatex range | Permatex range coverage |
Best Automotive Adhesives for Rubber by budget
| Tier | What you get | Example pick |
|---|---|---|
| Budget | One general-purpose tube for weatherstripping and seams | Permatex 81158 Black Silicone |
| Mid-range | A clear tube for visible seams plus a black tube for trim | Permatex 80050 Clear RTV |
| Specialist | A high-temp or oil-resistant maker for engine gasket work | Permatex 81422 High-Temp RTV |
Types of automotive adhesives
| Type | Strengths | Best for |
|---|---|---|
| RTV silicone sealant | Flexible, waterproof, wide temperature range | Weatherstripping, vinyl tops, seams |
| Sensor-safe RTV | Cures without damaging oxygen sensors | Engine gaskets near sensors |
| Oil-resistant gasket maker | Resists oil while sealing flanges | Oil pans, valve covers, gearboxes |
| Weatherstrip adhesive | Bonds stripping and trim to body and metal | Weatherstripping and trim bonding |
Detailed reviews
Each review below states the maker use list, temperature range and cure time exactly as the maker or listing publishes them, so you can match the adhesive to your rubber before you spend anything.
Best Overall: Permatex 81158 Black Silicone Adhesive Sealant
Best Overall — general-purpose black RTV for weatherstripping and seams
Why the Permatex 81158 Black Silicone Adhesive Sealant is our pick
Permatex 81158 is the top pick because it is the most broadly useful tube in this guide: listing evidence describes it as a general-purpose black RTV indoor and outdoor sealant that bonds, repairs, seals, mends and secures glass, metal, plastics, fabric, vinyl, weatherstripping and vinyl tops, while protecting and repairing electrical wiring. It lists a temperature range of minus 75 to 450 degrees Fahrenheit, waterproof and flexible behaviour, and resistance to oil, water, weather, vibration and grease, with a 24 hour full cure in a 3 ounce tube. Its honest limit is engine gaskets: the listing states it is not recommended for engine gasket applications, so gasket work needs the 81422 or Ultra Black below. For everything else rubber in a car, this is the first tube to reach for.
Permatex 81158 Black Silicone Adhesive Sealant key specs
- Adhesive type: black RTV silicone adhesive sealant
- Part number: 81158
- Size: 3 oz tube
- Colour: black
- Temperature range: minus 75 to 450 degrees Fahrenheit
- Full cure time: 24 hours
- Uses: weatherstripping, vinyl tops, seams, roofs, windshields, door frames, electrical wiring
- Not recommended: engine gasket applications
- Resistance: oil, water, weather, vibration, grease
- Maker: Permatex
- ASIN: B000AL6WLA
- Warranty: Not published
Permatex 81158 Black Silicone Adhesive Sealant: fits and best for
Best for weatherstripping and seams.
Permatex 81158 Black Silicone Adhesive Sealant pros and watch-outs
- General-purpose black RTV for weatherstripping, vinyl tops, seams and wiring.
- Wide temperature range from minus 75 to 450 degrees Fahrenheit.
- Waterproof, flexible and resistant to oil, water, weather, vibration and grease.
- Named part number with a published 24 hour cure.
- Not recommended for engine gasket applications, per the listing.
- Full cure takes 24 hours, so the repair cannot be stressed early.
- Black colour shows on light trim, where clear RTV suits better.
Permatex 81158 Black Silicone Adhesive Sealant: what owners report
- Listing evidence describes the 81158 as bonding, repairing, sealing and securing weatherstripping and vinyl tops. (Permatex 81158 listing evidence)
- Maker manual pages confirm the 81158 is a general-purpose RTV for indoor and outdoor applications. (Permatex 81158 manual pages)
- Owner coverage for this sealant is broad across weatherstrip and seam repairs in retailer listings. (Permatex 81158 listing evidence)
Permatex 81158 Black Silicone Adhesive Sealant: who should not buy
If your job is an engine gasket, do not buy this tube; buy the 81422 or Ultra Black below instead.
Permatex 81158 Black Silicone Adhesive Sealant: pair it with
Pair it with a clean rag and a scraper, because surface preparation decides whether RTV bonds or peels.
We may earn a commission at no cost to you.
Tip: clean both surfaces, apply a steady bead, and leave the repair undisturbed for the full 24 hour cure. sealants for beginners guide
Best Clear Finish: Permatex 80050 Clear RTV Silicone Adhesive Sealant
Best Clear Finish — clear RTV where the repair must not show
Why the Permatex 80050 Clear RTV Silicone Adhesive Sealant is our pick
Permatex 80050 is the clear pick: listing evidence describes it as a professional formula, sensor-safe, general-purpose clear RTV sealant for inside and outside use, sealing, bonding, repairing, mending and securing glass, metal, plastics, fabric, vinyl, weatherstripping and vinyl tops. It lists a temperature range from minus 75 to 400 degrees Fahrenheit and a 3 ounce size, with waterproof and flexible behaviour and resistance to water, weather and vibration. Its limit is temperature: 400 degrees maximum is below the black 81158 range, so hot gasket-adjacent work needs the 81422 instead. For a visible seam on light trim or glass, though, clear beats black every time, because the repair disappears instead of announcing itself.
Permatex 80050 Clear RTV Silicone Adhesive Sealant key specs
- Adhesive type: clear RTV silicone adhesive sealant
- Part number: 80050
- Size: 3 oz
- Colour: clear
- Temperature range: minus 75 to 400 degrees Fahrenheit
- Sensor-safe: yes, per listing
- Uses: glass, metal, plastics, fabric, vinyl, weatherstripping, vinyl tops
- Not recommended: engine gasket applications
- Resistance: water, weather, vibration
- Maker: Permatex
- ASIN: B0002UEPVI
- Warranty: Not published
Permatex 80050 Clear RTV Silicone Adhesive Sealant: fits and best for
Best for visible seams and light trim.
Permatex 80050 Clear RTV Silicone Adhesive Sealant pros and watch-outs
- Clear finish that disappears on light trim and glass edges.
- Sensor-safe formula for work near sensors.
- General-purpose RTV for glass, metal, plastics, fabric and vinyl.
- Waterproof and flexible with weather and vibration resistance.
- Maximum temperature is 400 degrees, below the black 81158 range.
- Not recommended for engine gasket applications.
- Clear RTV can be harder to see during application, so coverage must be checked carefully.
Permatex 80050 Clear RTV Silicone Adhesive Sealant: what owners report
- Listing evidence describes the 80050 as a sensor-safe, general-purpose clear RTV sealant for inside and outside use. (Permatex 80050 listing evidence)
- Listing evidence gives its temperature range as minus 75 to 400 degrees Fahrenheit. (Permatex 80050 listing evidence)
- Owner coverage for this sealant is thin in the sources reviewed, so test visibility on a hidden spot first. (Permatex 80050 listing evidence)
Permatex 80050 Clear RTV Silicone Adhesive Sealant: who should not buy
If your repair runs hotter than 400 degrees, buy the 81422 high-temp RTV instead of this clear tube.
Permatex 80050 Clear RTV Silicone Adhesive Sealant: pair it with
Pair it with masking tape along the seam, so the clear bead stays exactly where you want it.
We may earn a commission at no cost to you.
Tip: apply in good light and check the bead from several angles, because clear sealant hides gaps easily. vehicle plastic trim restorer
Best High-Temp Gasket Maker: Permatex 81422 Sensor-Safe High-Temp RTV Silicone Gasket Maker
Best High-Temp Gasket Maker — sensor-safe RTV for hot gasket work
Why the Permatex 81422 Sensor-Safe High-Temp RTV Silicone Gasket Maker is our pick
Permatex 81422 is the high-temperature pick: listing evidence gives it as a sensor-safe high-temp RTV silicone gasket maker in a 3 ounce size, with silicone material and a published UPC, from the Permatex gasket maker range. Its job is the one the general sealants refuse: engine gasket applications where temperatures run high and oxygen sensors sit nearby, and where a non-sensor-safe sealant could damage a sensor as it cures. Its limit is scope: it is a gasket maker, not a weatherstrip adhesive, so trim and stripping bonds still need the 81158 or 81850. For hot gaskets near sensors, though, this is the correct tube, and using a general sealant there risks both a leak and a sensor fault.
Permatex 81422 Sensor-Safe High-Temp RTV Silicone Gasket Maker key specs
- Adhesive type: sensor-safe high-temp RTV silicone gasket maker
- Part number: 81422
- Size: 3 oz
- Material: silicone
- Sensor-safe: yes, per product name
- Job: high-temperature gasket making
- UPC: 686226814227
- Maker: Permatex
- ASIN: B000AANXHC
- Warranty: Not published
- Weatherstrip use: no — gasket maker, not strip adhesive
- Temperature maximum: high-temp range, exact figure not in listing evidence reviewed
Permatex 81422 Sensor-Safe High-Temp RTV Silicone Gasket Maker: fits and best for
Best for hot engine gaskets.
Permatex 81422 Sensor-Safe High-Temp RTV Silicone Gasket Maker pros and watch-outs
- Sensor-safe formula for gasket work near oxygen sensors.
- High-temperature RTV from the Permatex gasket maker range.
- Silicone material in a 3 ounce size.
- The correct tube where general sealants are not recommended.
- A gasket maker, not a weatherstrip adhesive, so trim bonds need another product.
- Exact maximum temperature is not published in the listing evidence reviewed.
- Cure time is not published in the listing evidence reviewed.
Permatex 81422 Sensor-Safe High-Temp RTV Silicone Gasket Maker: what owners report
- Listing evidence identifies the 81422 as a sensor-safe high-temp RTV silicone gasket maker. (Permatex 81422 listing evidence)
- Listing evidence gives its size as 3 ounces with silicone material. (Permatex 81422 listing evidence)
- Owner coverage for this gasket maker is thin in the sources reviewed, so confirm sensor safety for your engine before use. (Permatex 81422 listing evidence)
Permatex 81422 Sensor-Safe High-Temp RTV Silicone Gasket Maker: who should not buy
If your job is weatherstripping or trim, do not buy a gasket maker; buy the 81158 or 81850 instead.
Permatex 81422 Sensor-Safe High-Temp RTV Silicone Gasket Maker: pair it with
Pair it with a gasket scraper and a clean flange, because gasket makers seal only on clean, flat surfaces.
We may earn a commission at no cost to you.
Tip: apply a continuous bead with no gaps, and torque the flange to the manual figures after the maker skin time. trim restoration products
Best Oil-Resistant Gasket Maker: Permatex Ultra Black Gasket Maker
Best Oil-Resistant Gasket Maker — oil-resistant maker for pans and covers
Why the Permatex Ultra Black Gasket Maker is our pick
Permatex Ultra Black is the oil-resistance pick in the Permatex gasket maker range, and its job is the one general RTV handles worst: sealing oil pans, valve covers and gearbox flanges where oil contact softens ordinary sealants. The honest limit is documentation in this research: no verified buyable Amazon listing for Ultra Black by that exact name surfaced with a confirmed ASIN, so the button below buys the written alternative, the Permatex 81158 black RTV, and both the card and this block say so plainly. That alternative is not oil-resistant in the same way, so treat it as a general black RTV fallback, not as an Ultra Black replacement. If oil resistance is the deciding factor, buy Ultra Black by name from a Permatex retailer, and use the alternative only for general black sealing work.
Permatex Ultra Black Gasket Maker key specs
- Adhesive type: oil-resistant gasket maker
- Part name: Ultra Black, Permatex gasket maker range
- Job: oil pans, valve covers, gearbox flanges
- Oil resistance: oil-resistant, per range positioning
- Colour: black
- Buyable Amazon ASIN: none verified — see alternative
- Temperature range: Not published in sources reviewed
- Cure time: Not published in sources reviewed
- Size: Not published in sources reviewed
- Maker: Permatex
- Weatherstrip use: no — gasket maker
- Warranty: Not published
Permatex Ultra Black Gasket Maker: fits and best for
Best for oil-exposed flanges.
Permatex Ultra Black Gasket Maker pros and watch-outs
- Oil-resistant formulation for pans, covers and gearboxes where general RTV softens.
- Black gasket maker from the Permatex range.
- The right class for oil-exposed flange sealing.
- Honest buying route stated, not hidden.
- No verified buyable Amazon listing surfaced, so the button buys the written alternative.
- The alternative is not oil-resistant in the same way.
- Exact temperature, cure and size are not published in the sources reviewed for this exact product.
Permatex Ultra Black Gasket Maker: what owners report
- Permatex range coverage places Ultra Black among oil-resistant gasket makers for automotive flange work. (Permatex gasket sealant directions page)
- Listing evidence for the Permatex gasket maker range shows black RTV variants for general sealing as the fallback. (Permatex 81158 listing evidence)
- Owner coverage specific to Ultra Black is thin in the sources reviewed, so confirm oil resistance for your flange before use. (Permatex 81158 listing evidence)
Permatex Ultra Black Gasket Maker: who should not buy
If oil resistance decides your repair, do not settle for the alternative; buy Ultra Black by name from a retailer.
Permatex Ultra Black Gasket Maker: pair it with
Pair it with a new gasket where the maker requires one, because a maker alone cannot fix a warped flange.
Buying note: Permatex Ultra Black Gasket Maker is listed here as a maker part with no verified buyable Amazon listing found during research, so the button below does not buy this exact part. It buys the written alternative, Permatex 81158 Black Silicone Adhesive Sealant, which is the closest buyable equivalent in this guide. Do not buy the alternative expecting the headline part.
Alternative: Permatex 81158 Black Silicone Adhesive Sealant — a general-purpose black RTV for weatherstripping and seams, as a fallback where oil resistance is not decisive
We may earn a commission at no cost to you.
Tip: clean oil from the flange completely before applying, because oil under a gasket maker prevents bonding. engine cleaning tools guide
Best Weatherstrip Bonding: Permatex 81850 Weatherstrip Adhesive
Best Weatherstrip Bonding — dedicated adhesive for stripping and trim
Why the Permatex 81850 Weatherstrip Adhesive is our pick
Permatex 81850 is the dedicated weatherstrip pick in the Permatex range, and its job is bonding weatherstripping and trim to body and metal, where a general sealant may seal but not hold. The honest limit is the same as Ultra Black: no verified buyable Amazon listing for 81850 by that exact part number surfaced with a confirmed ASIN in this research, so the button below buys the written alternative, the Permatex 81158 black RTV, and both the card and this block say so plainly. The alternative seals weatherstripping well, but it is a sealant first and a bonding adhesive second, so a stripping section that keeps lifting needs the dedicated adhesive. If bonding strength decides the repair, buy 81850 by part number from a Permatex retailer.
Permatex 81850 Weatherstrip Adhesive key specs
- Adhesive type: weatherstrip adhesive
- Part number: 81850, per Permatex range
- Job: bonding weatherstripping and trim
- Substrates: stripping to body and metal
- Buyable Amazon ASIN: none verified — see alternative
- Temperature range: Not published in sources reviewed
- Cure time: Not published in sources reviewed
- Size: Not published in sources reviewed
- Colour: Not published in sources reviewed
- Maker: Permatex
- Sealant versus adhesive: bonding adhesive, not general sealant
- Warranty: Not published
Permatex 81850 Weatherstrip Adhesive: fits and best for
Best for bonding stripping and trim.
Permatex 81850 Weatherstrip Adhesive pros and watch-outs
- Dedicated bonding adhesive for weatherstripping and trim, where general sealants may seal but not hold.
- Part number documented in the Permatex range.
- The right class for a stripping section that keeps lifting.
- Honest buying route stated, not hidden.
- No verified buyable Amazon listing surfaced, so the button buys the written alternative.
- The alternative is a sealant first, not a dedicated bonding adhesive.
- Exact temperature, cure, size and colour are not published in the sources reviewed for this exact product.
Permatex 81850 Weatherstrip Adhesive: what owners report
- Permatex range coverage places weatherstrip adhesive among dedicated bonding products for stripping and trim. (Permatex gasket sealant directions page)
- Listing evidence for the Permatex 81158 shows black RTV sealing weatherstripping as the fallback use. (Permatex 81158 listing evidence)
- Owner coverage specific to 81850 is thin in the sources reviewed, so confirm bonding strength for your stripping before use. (Permatex 81158 listing evidence)
Permatex 81850 Weatherstrip Adhesive: who should not buy
If a stripping section keeps lifting after a sealant repair, do not repeat the sealant; buy the dedicated weatherstrip adhesive.
Permatex 81850 Weatherstrip Adhesive: pair it with
Pair it with clamps or tape to hold the stripping in place while the adhesive cures, because a bond that moves before curing never holds.
Buying note: Permatex 81850 Weatherstrip Adhesive is listed here as a maker part with no verified buyable Amazon listing found during research, so the button below does not buy this exact part. It buys the written alternative, Permatex 81158 Black Silicone Adhesive Sealant, which is the closest buyable equivalent in this guide. Do not buy the alternative expecting the headline part.
Alternative: Permatex 81158 Black Silicone Adhesive Sealant — a general-purpose black RTV that seals weatherstripping well, as a fallback where bonding strength is not decisive
We may earn a commission at no cost to you.
Tip: clean old adhesive fully from both surfaces before bonding, because new adhesive bonds to old residue, not to the substrate. grille guards for trucks
Spec comparison
The table below lines the five picks up on the same ten points, so the trade between general sealing, gasket making and dedicated bonding is visible at a glance.
| Specification | Permatex 81158 Black Silicone Adhesive Sealant | Permatex 80050 Clear RTV Silicone Adhesive Sealant | Permatex 81422 Sensor-Safe High-Temp RTV Silicone Gasket Maker |
|---|---|---|---|
| Adhesive type | Black RTV | Clear RTV | High-temp RTV |
| Size | 3 oz | 3 oz | 3 oz |
| Temperature range | -75 to 450 F | -75 to 400 F | High-temp |
| Full cure | 24 hr cure | Sensor-safe | Sensor-safe |
| Maker use | Weatherstrip | Visible seams | Gaskets |
| Colour | Black | Clear | High-temp |
| Sensor-safe | 450 F max | 400 F max | Hot |
| Oil resistance | 24 hr | Sensor-safe | Sensor-safe |
| Part number | General | Visible | Gasket |
| Warranty | 81158 | 80050 | 81422 |
| Check Price | Check Price | Check Price | Check Price |
| Specification | Permatex Ultra Black Gasket Maker | Permatex 81850 Weatherstrip Adhesive |
|---|---|---|
| Adhesive type | Oil-resistant | Strip adhesive |
| Size | Gasket | Bonding |
| Temperature range | Oil pans | Trim |
| Full cure | Oil-resistant | Bonding |
| Maker use | Flanges | Stripping |
| Colour | Black | Bond |
| Sensor-safe | Oil | Trim |
| Oil resistance | Resistant | Bond |
| Part number | Gasket | Strip |
| Warranty | Ultra Black | 81850 |
| Check Price | Check Price | Check Price |
Installation and use basics
Start with both surfaces clean, dry and free of old adhesive, oil and grease, because no adhesive bonds to contamination. For RTV, apply a steady, continuous bead with no gaps, join the parts, and leave the repair undisturbed for the maker cure time: 24 hours for the 81158. For gasket makers, clean the flange flat, apply the bead, and torque to the manual figures after the maker skin time. For weatherstrip bonding, apply to both surfaces where the maker directs, press the stripping home, and clamp or tape it until cured. Never stress, wash or drive hard on a fresh bond before its cure time, and never use a sealant where the maker states it is not recommended.
Related how-to reading: sealants for beginners guide vehicle plastic trim restorer trim restoration products under 1000 trim restoration products or reviews headlight restoration solution paint protection film kits under 50 paint protection film kits under 200 underbody protection Woolwax review underbody protection that works seat upholstery kits.
Safety essentials
- Work in ventilation when using RTV and adhesives, and keep them away from flames.
- Wear gloves and eye protection, because uncured sealant irritates skin and eyes.
- Never use a sealant where the maker states it is not recommended, especially engine gaskets.
- Keep adhesives away from oxygen sensors unless the product is sensor-safe.
- Allow the full maker cure time before stressing, washing or driving on the repair.
- Dispose of tubes and rags properly, and keep adhesives away from children and pets.
Three accessories worth having with this kit:
- Torin Big Red Jack Stands, 3 Ton — rated stands for any under-vehicle adhesive or gasket work. Check Price
- Gasket scraper set — for clean flanges and full removal of old adhesive. See our guide: sealants for beginners guide.
- Masking tape and clamps — for holding weatherstripping in place while adhesive cures. See our guide: vehicle plastic trim restorer.
Troubleshooting
| Symptom | Likely cause | Fix |
|---|---|---|
| Bond peels after curing | Contaminated or oily surface | Strip fully, clean both surfaces, and rebond |
| Seal leaks after curing | Gap in the bead or wrong product | Remove, reapply a continuous bead, and check the maker use list |
| Bond still soft after days | Cure time not reached or cold, damp conditions | Allow more cure time in warmth and dry air |
| Sensor fault after sealing | Non-sensor-safe sealant near a sensor | Remove the sealant and refit with a sensor-safe RTV |
| Stripping lifts again | Sealant used where a bonding adhesive was needed | Refit with the dedicated weatherstrip adhesive |
| Gasket weeps oil | General sealant softened in oil | Refit with an oil-resistant gasket maker |
Who should NOT buy these
Engine gasket owners should not buy the general 81158 or 80050 sealants: both listings state they are not recommended for engine gasket applications, and our sealants for beginners guide explains the split. Buy a gasket maker for gaskets.
Weatherstrip owners whose stripping keeps lifting should not repeat a sealant repair: a sealant seals, a bonding adhesive holds, and the 81850 class is the honest buy for a lifting section.
Sensor-adjacent work should not use a non-sensor-safe sealant near oxygen sensors: buy the sensor-safe 81422 or 80050, because a sensor fault costs more than the right tube.
Buyers who cannot wait for a cure should not bond a part that must return to service immediately: allow the full maker cure time, or choose a mechanical fix instead.
Final verdict
Best Overall: Permatex 81158 Black Silicone Adhesive Sealant — Check Price
Best Clear Finish: Permatex 80050 Clear RTV Silicone Adhesive Sealant — Check Price
Best High-Temp Gasket Maker: Permatex 81422 Sensor-Safe High-Temp RTV Silicone Gasket Maker — Check Price
Best Oil-Resistant Gasket Maker: Permatex Ultra Black Gasket Maker — Check Price
Best Weatherstrip Bonding: Permatex 81850 Weatherstrip Adhesive — Check Price
FAQ
What is the best adhesive for rubber weatherstripping?
For sealing weatherstripping, Permatex 81158 black RTV is the best general pick: it bonds, seals and secures weatherstripping and vinyl tops, with a minus 75 to 450 degree range and a 24 hour cure. For bonding a stripping section that keeps lifting, the dedicated 81850 weatherstrip adhesive is the better class, because it bonds rather than merely seals.
Can I use silicone sealant on engine gaskets?
Not the general sealants in this guide: both the 81158 and 80050 listings state they are not recommended for engine gasket applications. For gaskets, buy a gasket maker like the sensor-safe 81422 high-temp RTV or the oil-resistant Ultra Black, matched to temperature and oil exposure.
What does sensor-safe mean?
Sensor-safe means the sealant cures without releasing compounds that damage oxygen sensors. Near sensors, use a sensor-safe RTV like the 81422 or 80050, because a non-sensor-safe sealant can cause a sensor fault that costs far more than the right tube.
How long does RTV take to cure?
The Permatex 81158 lists a 24 hour full cure, and other RTV products vary by maker. Leave the repair undisturbed for the full maker cure time, without stressing, washing or driving hard on it, because early stress breaks the bond before it forms.
Black or clear RTV: which should I buy?
Buy black for black weatherstripping, trim and hidden seams, where it disappears. Buy clear for visible seams on light trim and glass edges, where a black bead would show. Colour is not vanity: a visible repair that looks wrong gets redone, and a redone repair costs more than the right tube.
Why did my weatherstrip bond fail?
The usual causes are a contaminated surface, a sealant used where a bonding adhesive was needed, or stress before the cure finished. Strip fully, clean both surfaces, use the dedicated weatherstrip adhesive for a lifting section, and clamp or tape it until cured.
Can adhesive fix a torn weatherstrip?
A small split can sometimes be sealed, but a torn, hardened or flattened weatherstrip should be replaced, because no adhesive restores its sealing shape. Adhesive suits bonding and sealing intact stripping, not resurrecting rubber that has lost its form.
What temperature range do I need?
Check the highest temperature the repair will actually see, not the average. The 81158 covers minus 75 to 450 degrees Fahrenheit and the clear 80050 covers minus 75 to 400 degrees, while hot gasket work needs the high-temp 81422. Buy the range that covers your worst case.
Is the Ultra Black or 81850 buyable through this guide?
No verified buyable Amazon listing for either exact product surfaced during research, so both buttons buy the written alternative, the Permatex 81158 black RTV, and both cards and review blocks say so plainly. If oil resistance or dedicated bonding decides your repair, buy the named product from a Permatex retailer instead.
Sources
- Permatex 81158 listing evidence
- Permatex 81158 manual pages
- Permatex 80050 listing evidence
- Permatex 81422 listing evidence
- Permatex 81158 UK listing evidence
- Permatex gasket sealant directions page
- Permatex gasket maker retailer page
- Permatex Form-A-Gasket retailer page
- Permatex 81158 listing evidence (second)
- Assembly paste offers page
By Leo, Founder, WinchInsider
Leo covers winches, recovery gear and garage tools from maker documents and owner reports, and writes research-based guides with no testing claims.
Related guides
- Sealants for beginners guide
- Vehicle plastic trim restorer
- Trim restoration products under 1000
- Trim restoration products for small windows
- Engine cleaning tools guide
- Grille guards for trucks
Top pick: Permatex 81158 Black Silicone Adhesive Sealant
Check Price