Quote:
Originally Posted by racepar1
Foam filling will certainly increase chasis rigidity greatly. I am actually likely going to go that route with my next build, which will be an actual street car. The downside is that it can trap moisture and promote rust. I wouldn't imagine that it would be much of a problem in the southwestern states, but elsewhere it could be a real issue. I would also imagine that there are certain foams out there that would be better or worse for water absorbtion, but I have not gotten that far into researching it yet.
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Marine grade pour foam is water proof. The only think you have to worry about is if you leave something half filled or pockets that can trap air. Other than that if you cap off or silicone shut any foam filled area so its water tight you shouldnt ever have an issue.
Check US Composites. I used their 8lb pour foam with great results.