I am in process of defretting one of my own necks and taking the fretwires out with the epoxy coating holding them in was getting to me after a short while. I got an idea for using my compressor and a rubber tipped air nozzle. Get up to 150# of air and find someplace that has been opened by a knife or alongside the outer edge and then putting the rubber tip right up close to the surface, just blast it with the air. I managed to pop quite a lot of the epoxy off the neck that way. I also have an old Ovation Ultra (Ultra-Heavy) Bass in process for a refinish and at one of the old chipped places, I tried the air-nozzle trick and it blew huge pieces of the finish off - some of it in sheets. This may not work for 100% of the finish removal, but it sure helps a lot.