I did a skin on frame covered with canvas and sealed with a UV activated body filler, but oil based paint works too,I'm told the life span of the canvas is only about 5 years, I sold my boat before it got to that age so I don't know if that's accurate or not. My plans came from a book by George Putz, very informative book. I'm thinking of doing a nylon covered canoe, I find it hard to get in and out of a kayak these days.