I know the first choice for most people is sanding. Some people have suggested there are safe chemical strippers, but I don't trust that. Another alternative to sanding would be media blasting. Several sites have products listed as safe for fiberglass. I'm pretty sure they are referring to Corvettes and boats though. At the softer end of abrasives there is baking soda and plastic bead. The mid-range would be glass bead and the real rough stuff would be sand. Has anyone tried soda or plastic bead blasting to remove paint from an epoxy fiberglassed aircraft? Are there any educated opinions if not?