I am a new builder and yesterday I fiberglassed the hull of my Shearwater 16 Hybrid and had 2 problems that made me think that I now had a Viking Funeral Ship.
Problem 1. The Shearwater hybrid requires 3 seperate layers of fiberglass on the hull. Each of these are different sizes thereby leaving a raw fiberglass edge. When I squeegeed the epoxy, the fibers unthreaded leaving hairs or strings on the hull. This caused a lot of stress trying to deal with them which was impossible. The next day I decided to sand them out prior to putting on the second coat. I rationalized that the end result would be better if the next coats were put on a good, solid base. It worked great and the moral is DON'T SWEAT THE LITTLE HAIRS! I suggested to CLC that they put something in the manual warning about this. It will save builders a lot of grief.
Problem 2. While fooling with the hairs, my epoxy thickened a bit. It was not really noticeable but I new I needed to work fast because the cup was beginning to heat. I epoxied a section and the epoxy would not wet the wood. I immediately mixed up a new batch and it still would not wet causing a white area. I decided to sand the fiberglass down to the wood and make 2 square patches of which one was slightly smaller and installed them. Again, it worked great!
I hope that my experiences help other builders that run into the same type of thing. I'm finding that this is really a lot of fun to build and if you work methodically it works. If it doesn't, most of this stuff if fixable.