The sailboat I purchased this past spring has mositure problems especially in the aft cabin. It seems that the coldness of the sea water causes condensation on the inside hull surfaces which in turn soaks the bunk cushions. The problem is too severe for the dry bunk product. While I plan to install solar powered vents and such, does anyone have any experience with using some sort of insulation material against the hull? I was thinking that closed cell foam might work?