I've begun stripping blue fiberglass off an old w/c canoe, builder unknown. Actually there are two layers of glass plus paint on top, and the good news is that with the heat gun and a putty knife, the glass is coming off fairly easily with little wood coming along with it. But what puzzles me is that the coarse layer of glass which is against the wood is dark blue, all the way thru to the wood. I'm not aware of any resin that is blue. Maybe someone added blue pigment to the resin thinking that would look just fine and paint over the top would not be needed??? Whomever did this glassing did not take off the keel or outwales, but just tucked the fiber up along-side. That does make it easier to remove. It was a rough, lumpy, poor glassing job. Tom McCloud