no i didnt use sand paper. after i took off the bumper, i used a rag and dawn dish soap to clean it off real good and get any grease off of it. there are yet to be any cracks or chips
ya rattle can, like a spray can. looks good, i wanna do it. did you use sand paper to rough it up so the paint can stick or is holding pretty good anyway.
ummmm... a rattle can? i just took some krylon black spray paint and painted the valance and grille plastic