[mikeinatlanta]

One thing you need to be aware of is that the FFR body is made from vinylester resin and glass. Any body repairs or mods will need to be made with vinylester based products or you will negatively impact overall repair strength and durability. For a heavy fiber reinforced filler (working gaps, fender edges, etc.) use 3M HSRF, available at marine supply houses. For fiberglass repairs (filling a miscut hole, cracks, etc.) use glass and vinylester resin, available at several composite supply houses.
For normal bodywork, the industry standard polyester based products work fine. Opinions on which is best vary widely.