I finished a pepakura helmet and im getting ready to strengthen the helmet. I was wondering if you MUST fiberglass the helmet or if you can do a layer of fiberglass resin and then do the rest of the helmet with bondo auto body filler and sand it into shape. I was wondering if anyone has tried strengthening a pep helmet with auto body filler and how well it worked out. Ive worked with auto body filler before but not in this particular scenario (I have NEVER built a replica helmet before). Any help would be greatly appreciated.