The Nelson Waterbase sticks fine to Fiberglass as long as you use their primer. The only other primer that works well with the Nelson paints is Rustoleum (AUTOMOTIVE) primer. It must say Automotive on the can or it will not work.

I've done my last few planes with this paint, and I'm starting to like it. There has definately been a learning curve, but I think I'm just about ready to do something nice with it. I love the clean up and not having to wear a respirator.