Posted by: radiomix on Dec-27-12 8:33 AM (EST)
The minimally expanding foams that wouldn't damage your boat aren't waterproof. Im sure there is a foam out there that is both waterproof and minimally expanding, but I don't know if they are available or affordable. It would seem that some of the spray foams that are used a moisture barriers and light insulation for homes would work, but I don't know about the reactivity if it. Plus they are more of a commercial product with limited availablity to consumers. I would just stick with float bags.
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