Stop in for a cup of coffee

WV64Signet said
What's a workaround substitute for the foam firewall gaskets?

Thinking of going to find some craft foam... but don't want that if the stuff like I have from DMT is somehow moisture resistant?

The foam plate you get under your steaks from grocery store? Or is it like us and some sort of cardboard.
Body shop guy gives me this foam with plastic sheet on one side. Windshield or body parts are wrapped with it.