i've finaly got some time to start working on the 85 - 90 ground effects i've had sitting around for a while. and where else would i think to turn to for some advice it seems like the front and rear FX are polyurethane and the sides are fiberglass, am i correct on this one? anyway, what should i use to take the paint off the polyurethane parts with out melting them? also theres a small crack in the rear bumpber cover, just under 3" long... what should i use to fix this?