I am making new cabinet doors in my 13' and expanding a couple of the closets in the process. The doors and storage areas in that narrow cabinet next to the bed are taller in the new models. I'm doing something similar. Because the doors are taller, I'll need to relocate at least two of the hinges. That will leave screw holes in the fiberglass. Is there a way to fill those to match the existing fiberglass, or at least come close? I know very little about working with fiberglass. Suggestions and comments would be very much appreciated.