A thin skin of bondo to fill in the pits is one option. Another would be to sand it down smooth.atdsupra said:the roughness in my car spoyler is not in the paint is in the material its made of . . . like a coarse metal sand paper, for that roughness I think regular bondo will do . . . and the surface will make the bondo easier to stick to the material . . .
I think its made of some kind of fiberglass resin rather than a poured mold because it doesn't melt. I sold one off a parts car to another forum member and when the buyer came to remove it, we discovered that one of the mounting studs had rusted and snapped. Rather than toss it, I was able to mig-weld a new stud in place without damage to the surrounding fiberglass material. I'm sure it would have melted had it been plastic.Marblehead said:Greg, are you sure these wings are just straight fiberglass? They look, to me, to be a glass-filled plastic; molten plastic with milled glass fibers added before molding. Milled glass fibers mixed with any sort of casting material adds superior strength and reduces shrinkage.