(If your talking about your bumper & side molding) We tried everything ! on this and we could never find anything, that would work ( keep the black-black ,not gray) for over a couple of weeks! so I finally just ended up buying all new molding
" it sucked! but what I've heard is that it just drys out" & there is nothing you can do ,Short of "storing out of the sun" and "conditioning every chance you get". And it was a '99, "and if its the metal with thin plastic/rubber over it", I've seen where it peels? on little cars you might have this around your window felts? I think there is a spray bomb fix
,But I've never used it. Sorry for the "news" . Maybe someone else here, can inlighten us both. ,,,,,,,,,,,???????????