Fiberglass consists of fiberglass mat that is saturated with a fiberglass resin. The fiberglass resin is a thick substance that needs a catalyst to harden. Fiberglass is a very durable material that will bond to almost any surface, including plastic, metal, wood and Styrofoam. For laying up fiberglass on hard materials such as metal it’s important to thoroughly scuff the surface to get a strong bond. All fiberglass materials can be found at your local auto parts supply store or at a marine supply store.
Grind the area of the metal that will be getting fiberglass applied to it using an air grinder. Scuff the entire area, removing any loose or damaged metal down to solid metal.