So i bought a 2nd hand bumper and side skirts for my Subaru , they need re painting from blue to silver , question is where do I start ? Do you need a special primer for bumpers ? A know years ago I used to use 1 k plastic primer but this will be done in 2k , not new to using 2k paints ,use them in work have a booth etc , I usually paint bare steel , epoxy then top coat tho haven't done any car stuff , advice would be appreciated ,