How we researched this guide
We compared 7 defroster repair and accessory products against maker and retailer listings, checked the two service bulletins that name the Frost Fighter tab bonding kit, and read owner and forum reports on rear defroster repair. Every part number and claim below traces to a maker page, a retailer listing or a linked source, and no specification was guessed where a source did not publish it.
We did not test any product. Two facts have to be stated plainly first: no Consumer Reports review roundup of defroster accessories was found in this research pass, despite the title. Consumer Reports does test car products, but it does not publish a defroster-accessories roundup that we could verify, so this guide does not pretend one exists. It reviews the accessories on maker documentation and owner reports instead. And no verified Amazon.com listing was found for any product here, so this guide carries no buy buttons.
The 30-second answer
Most dead rear defrosters are fixable without replacing the glass. If the grid lines are broken, buy a complete repair kit such as the Permatex 09117, which includes conductive silver adhesive for both grid lines and tabs. If only a power tab has come off the glass, buy a tab bonding kit such as the Frost Fighter 2000, which uses a two-part silver adhesive and is approved by General Motors for defroster tab bonding. If the grid lines are broken in several places, buy a grid repair kit such as the Frost Fighter 2120. Never solder a defroster tab: the heat can crack the glass. Let the adhesive cure for 24 hours at room temperature before you use the defroster.
Defroster accessories at a glance
| Product | Repairs | Key detail |
|---|---|---|
| Permatex 09117 | Grid lines + tabs | Complete kit, conductive silver adhesive |
| Permatex 21351 | Tabs | Tab adhesive, syringe dispenser |
| Frost Fighter 2000 | Tabs | Two-part silver adhesive, GM approved |
| Frost Fighter 2120 | Grid lines | Grid repair conductor, up to 35 inches |
| MG Chemicals 8331D | Grid lines + tabs | High-conductivity silver epoxy |
| Frost Fighter replacement tabs | Tabs | 2300-URX, 2307-NFE, vehicle-specific |
How to choose a defroster accessory
Diagnose first: grid, tab, or fuse
A rear defroster fails in three places. Broken grid lines show up as stripes of window that stay fogged while the rest clears. A detached tab shows up as a defroster that does nothing at all, with the tab visibly loose on the glass. A blown fuse or a failed relay shows up as a defroster that does nothing and has no visible damage. Check the fuse and the relay first: they cost nothing to check, and no repair kit fixes a blown fuse.
Grid repair vs tab bonding
Grid lines and tabs are different repairs. A grid repair paints a conductive line over a break in the heating element. A tab bonding repair glues a metal power tab back to the glass with a conductive adhesive, making the electrical and structural connection in one step. Buy the kit for the fault you have: a tab kit will not fix a broken grid line, and a grid kit will not reattach a tab.
Silver content is the spec that matters
Conductive adhesives work because they contain silver. The Frost Fighter tab bonding adhesive is over 80% silver, which the maker states is needed for the highly conductive bond a defroster tab requires. MG Chemicals’ 8331D is described as a high-conductivity silver epoxy. Compare the silver content and the conductivity claim, not the bottle size: a weak adhesive loses conductivity within weeks, which is the most common owner complaint about cheap kits.
Never solder a defroster tab
Direct heat from a soldering iron can crack the glass. Use only conductive adhesives designed for automotive glass. This is stated in every serious repair guide we checked, and it is the single most important rule in this category.
Cure time is not optional
Permatex’s instructions call for 24 hours at room temperature (70°F / 21°C) for a full cure, and for the defroster not to be used during that period. The Frost Fighter grid repair material uses the heat from the defroster to flash-cure, which is faster, but the tab bonding kit still needs its full cure. A repair used too early fails, and the failure looks like a bad product when it was a rushed cure.
When a kit will not help
A repair kit is for minor damage: isolated grid breaks and detached tabs. If most of the grid is damaged in multiple places, for example after a bad tint removal, a repair kit is the wrong tool: the grid needs replacement, not repair. Frost Fighter sells Clear View replacement defroster grids for cars that never had one, or for grids too damaged to repair. Know which side of that line your window is on before you buy.
Repair kits by fault
| Fault | What you need | Kit to ask for |
|---|---|---|
| Broken grid lines | Conductive paint + adhesive | Permatex 09117 or Frost Fighter 2120 |
| Detached tab | Two-part silver adhesive | Frost Fighter 2000 or Permatex 21351 |
| Tab missing entirely | Replacement tab + adhesive | Frost Fighter 2300-URX / 2307-NFE |
| Grid too damaged to repair | Replacement grid | Frost Fighter Clear View grid |
Detailed reviews: the accessories
Each product below is a real accessory with a published part number. None had a verified Amazon.com listing in this research pass, so none carries a buy button.
Permatex 09117 — Complete Rear Window Defogger Repair Kit
Why the Permatex 09117 is our pick
The Permatex 09117 is the complete kit: a two-part epoxy-based solution with conductive silver adhesive that reconnects broken grid lines and reattaches faulty power tabs. It includes the adhesive, a cleaning solution and a specialised applicator tool. It works on most OEM grid systems regardless of vehicle make, and it is the most widely available kit in this category. Repair guides describe it as a repair that costs under a tenth of a new rear glass assembly, and as a job that takes under an hour.
Permatex 09117 key specs
- Part number: 09117
- Type: Complete rear window defogger repair kit
- Repairs: Grid lines and tabs
- Adhesive: Conductive silver, two-part epoxy-based
- Includes: Adhesive, cleaning solution, applicator tool
- Compatibility: Most OEM grid systems, regardless of make
- Cure: 24 hours at room temperature (70°F / 21°C)
Permatex 09117: fits and best for
Best for a first-time repair where you do not yet know whether the fault is a grid break or a tab: the complete kit covers both. It is the kit to buy when you want one box that handles either fault.
Permatex 09117 pros and watch-outs
Pros
- Covers grid lines and tabs
- Widely available
- Complete kit with cleaning solution
Watch-outs
- Some owners report the adhesive losing conductivity within weeks
- Needs a full 24-hour cure
- No verified Amazon.com listing found
Permatex 09117: who should not buy
Do not buy it if only a tab is detached and you want the strongest possible bond. A dedicated tab bonding kit with a higher silver content is the better tool for that one job.
Tip: clean the repair area thoroughly and let it dry before you apply the adhesive. A dirty surface is the most common cause of a repair that does not stick.
Frost Fighter 2000 — Defroster Tab Bonding Repair Kit
Why the Frost Fighter 2000 is our pick
The Frost Fighter 2000 is the professional tab bonding kit: a two-part silver tab bonding adhesive, with sandpaper, stir sticks and mixing pads, and enough material for multiple repairs. The adhesive is over 80% silver for maximum electrical conductivity. It is approved by General Motors for defroster and defogger repair, and it is cited in Chrysler service bulletin 08-037-19 REV.B for the Jeep Wrangler and GM service bulletin 16-NA-171 for the Escalade, Suburban, Tahoe and Yukon 2012–2016. That service-bulletin record is the strongest evidence any product in this guide carries.
Frost Fighter 2000 key specs
- Part number: 2000
- Type: Defroster tab bonding repair kit
- Repairs: Reattaches separated tabs
- Adhesive: Two-part silver, over 80% silver
- Includes: Adhesive, instructions, sandpaper, stir sticks, mixing pads
- Tabs included: No, tabs are not included
- Approval: Approved by General Motors for defroster tab bonding
- Service bulletins: Chrysler 08-037-19 REV.B; GM 16-NA-171
Frost Fighter 2000: fits and best for
Best for a detached tab on any car, and the kit auto glass shops use. It is engineered specifically for tab bonding: it bonds aggressively to glass and defroster coatings and makes the highly conductive bonds a high-amperage defroster repair needs.
Frost Fighter 2000: who should not buy
Do not buy it for a broken grid line. It is a tab bonding kit, and the tabs are not included: buy the replacement tab separately if yours is missing.
Frost Fighter 2120 — Grid Repair Kit
Why the Frost Fighter 2120 is our pick
The Frost Fighter 2120 is the grid repair kit: a high-performance repair conductor for broken grid lines, with improved electrical properties and bonding over the earlier material. Each kit has 5 grams of repair conductor for up to 35 total inches of repairs using the recommended two coats, and it uses the heat from the defroster to flash-cure for a fast repair. The maker’s own note is important: this kit is for repairs, not rebuilds, and it is not designed for badly damaged defrosters where most of the elements are damaged in multiple places.
Frost Fighter 2120 key specs
- Part number: 2120
- Type: Grid repair kit
- Repairs: Broken grid lines
- Conductor: 5 grams, up to 35 inches of repairs, two coats
- Cure: Flash-cures with defroster heat
- Note: Repairs, not rebuilds
Frost Fighter 2120: who should not buy
Do not buy it if most of the grid is damaged. That needs a replacement grid, not a repair kit.
Permatex 21351 and MG Chemicals 8331D — Tab adhesive and silver epoxy
Why these are our pick
The Permatex 21351 is an electrically conductive rear window defogger tab adhesive in a syringe-like dispenser for precise application, with a cleaning solution and applicator tool included. The MG Chemicals 8331D is a high-conductivity silver epoxy for grid and tab repair, praised in buying guides for its industrial-grade adhesive performance. Together they are the two alternatives to the complete kits: the Permatex for a simple tab job, the MG Chemicals for a buyer who wants the strongest conductivity claim.
Permatex 21351 / MG Chemicals 8331D key specs
- Permatex 21351: Tab adhesive, syringe dispenser, cleaning solution included
- MG Chemicals 8331D: High-conductivity silver epoxy, grid and tab
- Both: Conductive silver formulations
Permatex 21351 / MG Chemicals 8331D: who should not buy
Do not buy either for a broken grid line if you have never done the repair before. A complete kit with instructions and applicators is the safer first buy.
Frost Fighter replacement tabs and Clear View grids
Why these are our pick
When the tab itself is missing or broken, adhesive alone is not enough: you need the tab. Frost Fighter sells replacement tabs by vehicle, including the 2300-URX for Ford, Chrysler and Chevrolet, and the 2307-NFE for GMC, Yukon, Suburban and Tahoe. For a grid too damaged to repair, Frost Fighter sells Clear View replacement defroster grids, including the 1210-2740-STK at 12.5 inches high by 27 to 40 inches wide, with 10 lines to match a factory grid. One owner report describes fitting two of these grids over a damaged factory grid for a working repair.
Replacement tabs and grids key specs
- 2300-URX: Replacement tab, Ford / Chrysler / Chevrolet
- 2307-NFE: Replacement tab, GMC / Yukon / Suburban / Tahoe
- 1210-2740-STK: Clear View grid, 12.5 in x 27–40 in, 10 lines
- Also available: Frost Fighter ThermaSync defroster and heated mirror control
How to repair a rear defroster
Find the fault first: test the grid lines with a multimeter or a test light, and check the fuse and relay. Clean the repair area with the cleaning solution from the kit and let it dry. For a grid break, paint the conductive adhesive over the break in two thin coats, following the line. For a tab, sand the tab and the glass lightly, mix the two-part adhesive, and press the tab into place. Let the repair cure for the full time the maker states — 24 hours at room temperature for Permatex — and do not use the defroster during the cure. Test the defroster after the cure and check that the repaired lines heat evenly.
Safety essentials
Defroster repair safety rules for every job:
- Never solder a defroster tab: the heat can crack the glass.
- Work on a cool window, never on hot glass.
- Do not use the defroster during the cure period.
- Keep conductive adhesive off the paint and trim.
- Wear gloves; silver epoxy irritates skin.
- Test the fuse and relay before you buy a repair kit.
Troubleshooting
| Symptom | Likely cause | Fix |
|---|---|---|
| Stripes stay fogged | Broken grid lines | Grid repair kit, two coats |
| Defroster does nothing | Detached tab, or blown fuse | Check fuse, then bond the tab |
| Repair fails in weeks | Dirty surface, or rushed cure | Clean properly, cure fully, reapply |
| Tab will not stick | Weak adhesive, or missing tab | Use a high-silver kit, buy a new tab |
| Most of the grid is dead | Grid too damaged to repair | Replace the grid, do not repair it |
Who should NOT buy these
Owners with a blown fuse: check the fuse and relay first. No repair kit fixes an electrical fault upstream of the window.
Owners with a badly damaged grid: a repair kit is for isolated breaks. A grid damaged in multiple places needs replacement, not repair.
Buyers who will solder: soldering a defroster tab can crack the glass. If you will not use conductive adhesive, have a glass shop do the repair.
Final verdict
Buy the kit for the fault you have. The Permatex 09117 is the complete kit for grid lines and tabs. The Frost Fighter 2000 is the professional tab bonding kit, with the strongest service-bulletin record in this category. The Frost Fighter 2120 is the grid repair kit for isolated breaks. Never solder a tab, always cure fully, and check the fuse before you buy anything. And note the title’s promise honestly: no Consumer Reports roundup of defroster accessories was found, so this guide rests on maker documentation and owner reports instead.
FAQ
Does Consumer Reports review defroster accessories?
No roundup was found in this research pass. Consumer Reports tests car products, but it does not publish a defroster-accessories roundup that we could verify. This guide reviews the accessories on maker documentation, service bulletins and owner reports instead.
Can a rear defroster be repaired?
Yes, usually. Isolated grid breaks and detached tabs are both repairable with a conductive adhesive kit, for a small fraction of the cost of a new rear glass assembly. A grid damaged in multiple places needs replacement, not repair.
Should I solder a defroster tab back on?
No. Direct heat from a soldering iron can crack the glass. Use only conductive adhesives designed for automotive glass.
How long does a defroster repair take to cure?
Permatex calls for 24 hours at room temperature (70°F / 21°C) for a full cure, with the defroster off during that period. The Frost Fighter grid material flash-cures with defroster heat, but the tab bonding kit still needs its full cure.
What is the difference between a grid kit and a tab kit?
A grid kit paints a conductive line over a break in the heating element. A tab kit glues a metal power tab back to the glass. They are different repairs, and buying the wrong kit fixes nothing.
Why did my repair fail after a few weeks?
The most common causes are a dirty surface, a rushed cure, or a weak adhesive. Clean the area properly, let the adhesive cure fully, and use a high-silver kit for tabs.
Do I need a new tab or just adhesive?
If the tab is still there and just detached, adhesive is enough. If the tab is missing or broken, buy a replacement tab — Frost Fighter sells them by vehicle — and bond it with the adhesive.
Why is there no buy button in this guide?
No verified Amazon.com listing was found for any product in this research pass. The part numbers in this guide let you order the exact kit from an auto parts retailer instead.
Sources & changelog
Maker and retailer sources: Car and Truck top heated rear window repair kits; How to choose a rear window defogger repair kit; How to repair a rear window defogger using a Permatex kit; Top 5 rear window defogger repair kits; Frost Fighter defroster repair kit flyer (2000 tab bonding kit, 2120 grid repair kit); Open Road forum rear defrost grid repair report.
Changelog — November 5, 2026: guide first published.
By Leo, Founder, WinchInsider
Leo researches winches, recovery gear and automotive parts from maker spec sheets and owner reports, and writes the guides on this site. Read more on our about page.