I got a few spares to fall apart in a convection oven. They needed resealing. I used whatever I had laying around .. ge silicone 2... to reseal. good for 350 degrees. I waited the 24hrs with headlight out of the lense so it could dry. I tried it this morning and it expanded the lense right off the metal casing to let gas out!

Is this a matter of waiting longer, or should I scrap the whole idea and rescrape it down to use something else. The original gray silicone was just that, I could smell methane after the oven, indicating it is a similar material to regular silicone. Any ideas?

Some Silicone sealants will "gas" up to 2 weeks after application, particularly bathroom caulk. be sure to scuff up the adhered surfaces with some sandpaper, and clean with acetone. Because its a headlight, if you leave a small area on the bottom of the lens open for drainage and expansion, you will probably avoid the problem you are having, and it shouldent fog up because there wont be any water collecting in the bottom. Most every headlamp lens does have a drainage hole at the bottom somewhere

 

Hope that helps

-Mike

What I found works is Permatex Sealant Flowable Windshield Silicone available at Checker Shucks Kragen And Murrays, and probably elsewere, and seal it up that way because that head lamp has a drain built in on the back..

 

My .02

xoomer

hey thanks.

the gas did indeed stop. As it turns out, they all gain pressure.

The lense in question is on its last legs, an original from 1987. the chrome on the inside has started to disappear on the edges, etc. I watched it on high beam, and it is the metal case moving, not the lense. Be it is sealed tightly (the black ge silicone was excellent after all - I just won't count on ever getting it off the lense again.) I am going to zap my ugly lense with a welder.

Maybe I can hook a chain up to it and tow the car afterwards...

I used the ge silicone on my windshield, awesome stuff. Will seek out the other stuff mentioned, thank you.

you might just replace them. post in wanted. keep your brackets as the brackets are different between 85/6 and 87+. These aren't hard to find and don't usually go for much on the board.