Wouldn't it have been alot easier and faster just to 220 all the moldlines and texture then primed and painted? IMO 600 dosn't leave a big enough scratch to put primer down on expecally on plastic. I would use promotor on any plactic peice just because plastic can be weird. We just painted some plastic peices on a quad, just went over with a marron scuff pad and painted them, the paint started flaking off the second we got them on the quad. I did a set of SS Mirrors, I used 400 on all the big areas, then with a marron scuff pad, i got into all the edges and cracks, painted and clearned them, they looked good and no flackage.Zeeke98 said:I sanded down the mold lines and the text that was molded on the bottom of the mirror with 400 then went to 600 then primed and painted. You don't need any adhesion promotor if the're sanded with 600.