covering a composite canoe and leaving it out in the weather. It would be best to set up a rack and "tent" the cover so it doesn't rest right on the hull. My earliest solo canoe developed hydrolysis blisters, and I think one reason was that I stored it outside with a tarp right against the hull. One of only two gelcoated boats I have ever owned. Vinylester and epoxy are much less likely to develop hydrolysis.
I don't know whether there are vinylester based gelcoats, but any polyester gelcoat is susceptible to hydrolysis. West Epoxy makes a lot of money off FG powerboat owners who get massive gelcoat hydrolysis problems and have to rehab to sell their boats.
Clipper's advice about urethane spar varnish for the inside is very good. West 105/207 is fairly UV resistant, but not to the degree of a quality spar varnish.
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