C6 Underbody Question
 

I found an old thread about this area and I have to ask.....has anyone filled this void with spray in foam? I have been under my car a bunch the last month or two and on both sides the thick rubber tape is gone and the holes are exposed. There is also access to the cavity up near the front......this cavity is not fully sealed and was wondering why I couldn't just fill it with some high density foam and once it's cured trim the excess and spray with the Flex Seal stuff you see on TV? This would seal it permanently to keep moisture out and would help (maybe not) deaden this area a little bit.

Can anyone give a good reason this is not a good idea????

https://cimg3.ibsrv.net/gimg/www.cor...c6c68feba3.jpg
Why not fill this void with foam?

The factory didn't see fit to apply seam sealer there, and C6s don't seem to be rusting out... so I'd be loathe to fix what isn't obviously broken. Especially when the fix is irreversible and the long-term consequences are unobvious.

Generally it's better to give things a way to dry out rather than to attempt to make them watertight. If the foam fill is incomplete or comes loose, it could end up trapping water inside. Or if it's open-cell, it could act like a damp sponge.

:iagree: If it ain't broke, don't fix it!

+1 not to do it for this reason^.

Trying to reverse it would be a complete nightmare. You're better off just getting a water tight seal over the holes if you're worried the tape is missing. (Maybe do a small rubber plug with some RTV gasket around it or something?)

Water is a sneaky B*&^%, probably good to have a way for it to get out.

I'd be worried that the foam and or flex seal couldn't take the heat in addition to all the above.

The metal is so thick that foam wont do fk all.

Leave it be.