I started my 85 crew cab project, and got the bed off, doors off and front end off. Starting to do bodywork, I wanted to fix the fiberglass dually fenders. After grinding the cracks down, i realized that I'm not sure exactly what they are made of, nor what material to use to repair them
. They look like an smc with a thin layer of fiberglass sandwiched in the middle. Does anyone know what they are for sure, and what I should use to repair them?
Thanks,
Jim

Thanks,
Jim