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Permatex 21351 Electrically Conductive Rear Window Defogger Tab Adhesive

3 out of 5 stars 234 customer reviews

List Price: $15.23
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Single Unit
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  • Complete two-part kit
  • Provides a low-cost, high-quality repair
  • Easily bonds defogger tab to grid on rear window
  • Suggested Applications: Rear window defogger tabs

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Frequently Bought Together

  • Permatex 21351 Electrically Conductive Rear Window Defogger Tab Adhesive
  • +
  • Permatex 09117 Complete Rear Window Defogger Repair Kit
Total price: $27.96
Buy the selected items together


Product Information

Size:Single Unit

Technical Details

Brand Permatex
Item Weight 0.3 ounces
Product Dimensions 0.4 x 3.8 x 6.5 inches
Origin China
Item model number 21351
Manufacturer Part Number 21351
OEM Part Number 21351
Folding No

Technical Specification

Additional Information

ASIN B000HBGKWE
Customer Reviews
3 out of 5 stars 234 customer reviews

3 out of 5 stars
Best Sellers Rank #8,551 in Automotive (See top 100)
#74 in Automotive > Oils & Fluids > Body Repair & Restoration Chemicals > Adhesives
Shipping Weight 0.3 ounces (View shipping rates and policies)
Domestic Shipping Currently, item can be shipped only within the U.S. and to APO/FPO addresses. For APO/FPO shipments, please check with the manufacturer regarding warranty and support issues.
International Shipping This item is not eligible for international shipping. Learn More
Date First Available July 7, 2004

Warranty & Support

Warranty, Parts:Parts

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Product Description

Size: Single Unit

Permatex Electrically Conductive Rear Window Defogger Tab Adhesive quickly and easily bonds defogger tab to grid on rear window. This is a complete kit, providing a low-cost, high-quality, quick repair for damaged rear window defogger tabs. Permatex provides repair solutions for windshields, rearview mirrors, rear window defoggers and headlight lenses.

Customer Questions & Answers

Customer Reviews

Top Customer Reviews

By G. Perrin on April 27, 2012
Size: Single Unit
You can read a whole bunch of reviews about how this product does or doesn't work. Key to success is going to the Permatex website and clicking on their Video Demo Online link. Choose the "Permatex® Complete Rear Window Defogger Repair Kit" video. They've partnered with GM, but the key here is that they show many more steps than the back of the package. The first part of the video is about the grid repair, you can skip to about the middle of the video to where they show the tab repair portion (unless you need to fix your grid as well, but then, you'd be on a different Amazon web page). So what was my key to success: preparation, preparation, ... you get the idea. First, remove the tab from the pigtail of the wiring harness. On my 2004 Ford Taurus, even that chore wasn't easy, it was pretty well locked in. Once out, you really have to get all the old adhesive off the mating surface of the tab. This took about 15-20 minutes of going slow with (in my case) a metal file to knock off the big chunks and then switching to the fine sandpaper called out in the video. Didn't see that on the back of the package? That step isn't there, but is essential. I also lighted sanded the window glass mounting area (very lightly), just to get rid of any roughness where the tab was previously fastened before it tore loose. Then you need to clean the surface of both the tab and the window glass mating surface with rubbing alcohol. Didn't see that step either, right? Watch the video!! So I broke out our trusty bottle of 70% IPA and a clean paper towel, soaked the towel, and meticulously wiped down the surface of the tab and the glass where it would mate, a number of times, allowing the IPA to dry / evaporate quickly in between.Read more ›
6 Comments 149 people found this helpful. Was this review helpful to you? Yes No Sending feedback...
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Size: Single Unit Verified Purchase
It worked fine for me, although judging from the other feed-backs, I am in the minority. I could also see metal defroster connection material remaining on the window below where the tab was pulled. So it wasn't a big gap I needed to bridge. I have used Permatex products, and have been happy with them, so I figured I'd give it a shot.

Maybe it was because I did something different..? Here is what I did:
-Cleaned the broken tab with a powered wire wheel to get a nice clean solder/shiny metal surface. A piece of sandpaper would probably do the same job.
-Cleaned both the tab and the spot on the rear window where it goes with Mineral Spirits as I had no "alcohol" handy as the directions suggested.
-Soaked the tab with the activator, and let it sit.
-While I waited, I kneaded the copper adhesive until it was completely mixed while waiting almost 5 mins for the activator. I probably did not wait the full 5 minutes for the activator to dry.
-I put a good size blob of adhesive on the window, and kind of mashed it into the spot with the edge of the tube, as it is a bit runny.
-Pressed the tab, very very firmly into the goo, and held it for over a minute.
-Went back later, and saw the goo had run down the glass a bit, and was surprised it was not solid, so I wiped up the drip, and was pleasantly surprised the tab was pretty solid. I did not test HOW strong yet.
-Went about other projects, and a few hours later, I attached the wire.
-This morning I tired the defroster, and to my surprise, it worked. Hopefully it will continue to work.

For the under $10 this costs, it was worth the gamble for me.
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By jxms7 on October 17, 2008
Size: Single Unit Verified Purchase
This is the second batch I've tried,on my defroster tab. The first never hardened, after completely following the directions I thought maybe I had bought an old package as I have used a lot of Permatex products and they usually work as advertised. I bought my second batch and followed directions as instructed, this time it adhered and I waited 24 hours before connecting the wire and trying it. Still didn't work. I had to run a bead of solder along the tab to get it to work. Bottom line, I could have used a one dollar bottle of superglue and 2 cents worth of solder to get better results.
1 Comment 16 people found this helpful. Was this review helpful to you? Yes No Sending feedback...
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Size: Single Unit Verified Purchase
I broke the tab off an expensive back window (Cadillac Escalade), and really hoped this would fix it and get it working again. A defroster in a long SUV in a Minnesota winter is a must. It seems like a great idea. I followed the instructions diligently. I cleaned and scrubbed everything as directed. I even let it dry longer than instructed before use. The instant I hooked up the coiled power wire to the tab (which put just SLIGHT tension on the hinged SUV window tab) it broke right off again. I scraped it off, cleaned everything back off again, re-checked the instructions, and tried it again with the same results.

The original tab is stuck in place with the same material that comprises the defroster lines: sintered metal. It's applied hot, as a spray and just sticks to itself. You can't duplicate that process.

I tried other methods to fix this problem:
I tried to solder it back on, but no combination of flux (either acid or rosin) would make any variation of solder stick (electrical, silver, lead-free, cold). You can't heat that large of an area up enough to make a good bond, without doing damage to the glass.

I even tried to mix fine copper dust with JB Weld steel epoxy. I kept the layer between the tab and the glass as thin as possible to keep the resistance to a minimum. I then layered more on top and around the area to keep it steady. It seemed to work OK for a while and it didn't break off. Until I started it remotely one day for about 15 minutes. When I got in I panicked because I smelled the distinct smell of burning-wire smoke. The epoxy had burned and smoldered. Thank goodness it didn't start a fire.

Feel free to try this stuff, but I suggest consulting a professional for repair or replacement. It's not something you should screw with yourself. The results could be bad.
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