[quote=samc99us]This is true, however some foams break down in contact with moisture. Single part expanding foam will deteriorate when exposed to moisture. Pool noodle stuff is decent. PVC, as used in many hulls, is good to very good. XPS is probably in between those (the pink/blue stuff you can get at your local hardware store). Kelgicell, which is a structural PMI foam developed for use in fuel tanks on lightweight racing hulls and primarily aircraft, is wonderful. It is what I use when I can. They all rely on the use of a sealant to prevent the water from entering to begin with. The 3M 4000/5000 series caulks are much better than straight silicon.[/quote]
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