ask questions before you talk shit dumbass. where i molded, we did sand to bare metal you fuck up. fiberglass molded to urethane?? wow, there is such things as flexible putty you dumb fuck. its not cracking or coming off, its held in rivets and not just bondo'd one. i mixed fiberglass resin and duraglass which is one of the most strongest fillers out there. its strong as god. you should really ask stuff BEFORE you assume ass plunger. damn!