Permatex 81730 Flowable Silicone Windshield and Glass Sealer - 1.5 oz.

by Permatex

Product Features

• Forms a tough, waterproof, durable, clear seal that is resistant to weather, extreme temperatures, vibration, shock and most shop chemicals
• Fills surface voids and irregularities
• Temperature range -80F to 450F
• Suggested Applications: Windshields, sunroofs, windows, headlamp assemblies, marine glass, RV vents and windows
• 1.5 fl oz tube

Product Details

View Technical Data Sheet [PDF]

• Product Dimensions: 1 x 3.8 x 8 inches ; 2.2 ounces
• Shipping Weight: 3.2 ounces (View shipping rates and policies)
• Shipping: This item is also available for shipping to select countries outside the U.S.
• ASIN: B000BKEBO0
• Item model number: 81730
• Average Customer Review: 4.4 out of 5 stars  See all reviews (7 customer reviews)
• Amazon Best Sellers Rank: #2,634 in Automotive (See Top 100 in Automotive)
  • #25 in Automotive > Oils & Fluids > Body Repair & Restoration Chemicals > Adhesives

Product Description

Wicking action silicone "seeks the leak". Flows into hidden and hard-to-reach areas.

Customer Reviews

Most Helpful Customer Reviews

18 of 20 people found the following review helpful:

4.0 out of 5 stars Good but oversold on capabilities, July 7, 2010

By 

Bud - See all my reviews
(VINE VOICE)   

Amazon Verified Purchase

This review is from: Permatex 81730 Flowable Silicone Windshield and Glass Sealer - 1.5 oz. (Automotive)

From the package: "Specially formulated wicking action silicone. Flows into hidden and hard-to-reach leaks around glass..."

I did not find that it really wicked at all. To me, it is just a more runny RTV silicone sealant. Because is thinner, it will flow somewhat into nooks better than you can squeeze normal silicone sealant yourself. This, overall, seems to contribute to a better seal, so it might be the best product for the application, but it is not anywhere as great as the description might lead you to believe. Also, because it is runny, it is better used on small gaps and where the application is horizontal. If at an angle or vertical, it will tend to run out and drip. You might be better off with two light applications based on this. Based on its performance to claims, I'd give it a bit under 4 stars.

One problem that this product (and most Permatex products) has is that it comes with a cut-off nozzle to apply the sealant. After you are done, there is no way to seal up the tube. Unfortunately, this makes it more of a one-time-use product and not so good if you want/need to do multiple applications because you still have a leak and/or the product leaked/ran out. I sealed the tip up extremely well with electrical tape, and it barely lasted overnight. (I had to cut some more of the tube off). Some other products (GE, I think) have a replaceable, screw cap over a pointed nozzle which would be much better. This probably knocks it down to 3 stars since it is not that cheap and not widely available.

Finally, it claims to be odor-free. While it is vastly better than the pungent smell of acetic acid, it is not odor-free, but not really bad at all. Very-low odor would be more accurate, although smell is lesser important to me, I round back up to 4 stars.

See my customer image of some landscape lights I was trying to seal from irrigation spray (which keeps corroding/ruining them). You can see that it flows better into crevices, but that it also has a tendency to run out. Hope you find my review useful.

3 of 3 people found the following review helpful:

5.0 out of 5 stars Permatex glass sealer, December 25, 2010

By 

Carlos Reyes Jr - See all my reviews

Amazon Verified Purchase

This review is from: Permatex 81730 Flowable Silicone Windshield and Glass Sealer - 1.5 oz. (Automotive)

i recently got this product to use on my 97 chevy astro van because the top part of the windshield leaked especially when it would rain, i applied this sealer across the top focusing more on the areas where it leaks and at first it seems like it wont dry and it might not work but if you let it dry for one good(sunny)day,it holds very well and almost feels like rubber, they where going to charge me $50 to replace the black rubber sealer that keeps the windshield in place and prevents water from coming in so this was definatly a better alternative and easy to use

5 of 6 people found the following review helpful:

5.0 out of 5 stars Works as Advertised, October 17, 2010

By 

David Hart (Boston, MA) - See all my reviews
(REAL NAME)   

This review is from: Permatex 81730 Flowable Silicone Windshield and Glass Sealer - 1.5 oz. (Automotive)

The description states that Permatex Flowable Silicone forms a tough, waterproof, durable, clear seal that is resistant to weather, extreme temperatures, vibration, shock and most shop chemicals and fills surface voids and irregularities. It also states that it is odor free.

My Murano had a leak in my rear hatch window seal aong the top of the window. I went to a glass shop to see if they could fix it. They couldn't because of the way the hatch is designed but, even if they could, it would have cost me $125. The only other option was to remove the window and re-seal the entire window. This came with the risk of the window being damaged and a $400 charge for replacement glass. My father suggested sealing it with silicone but I was doubtful that there was a product that would work with cars. However, a search turned up Permatex Flowable Silicone.

The application is simple enough. You clean the surface, remove the tube from the packaging, screw on the applicator tip, cut the end of the tip, and then apply the silicone. One thing to remember is that the silicone is flowable, basically it runs like molasses or honey until it sets (about 1 hour). It is designed to run so that it can flow into spaces and seal the hole. This is great for horizontal applications (like mine) but could be messy for verticle applications. It fully cures in 24 hours. While applying it, I didn't notice any odors, but I was applying it during a windy fall day, so there was plenty of ventilation.

Some reviewers mentioned that the package is missing a cap for the application tip. While this is true, in my opinion, its not necessarily a bad thing. Usually when sealant is left in the tip, even if you have a cap, it solidifies, forcing you to use a pin to poke a hole. In this case, you can clean the tip by taking it off of the tube tapping it a couple of times on papertowel and then leaving it upright on a clean part of the papertowel. Because the silicone is flowable, the tip will empty out and you can use it again. Just remember to put the cap back on the tube.

All of the technical stuff aside, it worked for me and I would recommend it to family and friends.