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Good info Last Indian.

Since you mentioned sun roofs....would you say that GM used the same EPDM material for both 2nd, 3rd, and 4th gen Camaro and Firebird  to seal T-tops or do you think GM may have used different materials over the course of time? I know leaking or whistling T-tops is a constant complaint a lot of guys have with these cars.

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1 hour ago, Frosty said:

Good info Last Indian.

Since you mentioned sun roofs....would you say that GM used the same EPDM material for both 2nd, 3rd, and 4th gen Camaro and Firebird  to seal T-tops or do you think GM may have used different materials over the course of time? I know leaking or whistling T-tops is a constant complaint a lot of guys have with these cars.

Well, my guess would be that from the 2nd generation to the 4th they are different, not sure where the 3rd falls. 2nd gen used a synthetic neoprene foam, I think (see below). This foam had a very thin skin that covered it. It was used for doors, trunk lids, T-tops Etc. The two main problems with this material was, first if you cut scraped or ripped the skin it was junk! It would then absorb water like a sponge. Secondly it had a bad tendency to take comprehension set over time and no chemistry would return it to normal. Mainly because the cell structure under the skin, towards the center of the piece had collapsed. By the 4th gen I’m pretty sure we were at EPDM weatherstripped. This may not be 100% accurate, with respect to materials for the different generations though, it has been a long time since I’ve seen the different generations up close to inspect all the specifics. I remember that I found a newer trunk weatherstripe from a different GM, but I don’t remember which, it could have even been from the “74”, but it wasn’t neoprene foam it was EPDM. Yet it had the right profile for the “69” trunk, so I bought a roll from the dealer and replaced what I had.

Edited by Last Indian
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