Thanks for the gracious comment and the question. The toilet paper does disintegrate, forming a matrix that bonds to the foil far better than a contiguous material like paper, the reason for wetting the roller. Boats would definitely float, but are not likely to be let out of their cases. I built sixteen of them and don't own one because I couldn't afford it. Seriously though, a good question and because the foil paper laminate is strong and will accept any finish, permanent waterproofing could be applied. Thanks again for asking.
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