Mine was painted so just sanded it back first with wet/dry paper and a block can't remember the grade but I just bought a coarse grade and a finer grade, rubbed it back with the coarse then went over with the finer grade. Then did 3 coats of primer, sanded that back with my fine sand paper think it was 320. Came up really smooth. Then I just did 3 coats of matte black bumper spray paid about $20 for it. Looks pretty sweet.