Re: replacing floor in ski boat, what to do about the foam
FYI - I spent some time on the phone with Dow yesterday, the makers of Great Stuff spray foam. The foam is closed cell and is actually coast gaurd approved for use as floatation in boats. That's the good news. The bad news is, it should only be used for filling small voids and sealing cracks. If you try to fill a large area with it, it will expand rapidly and the outer surface will cure first, sealing off air to the inner foam, resulting in a soft center that will never harden. You can still use it if you lay down lots of small lines of it. And do this in stages, allowing it to cure between stages. But this is time consuming and the cost per cubic foot is much higher than the pour in stuff. So in conclusion, I think it is fine for small foam repair and and sealing cracks, but it's really not going to perform well for a large area fill like between stringers.