High Traffic:
Door handles. Cup Holders. Door sill pieces.
I am having the entire thing painted, twilight blue, my vents and bezel and some other pieces will be racing silver.
If you paint it i recommend you do this:
Take it ALL out and do it all at once. This way you dont have 3 different shades of the same color paint lol. Sometimes the paint just differs ever so slightly and you can tell a difference in the sun. If you buy the paint all at the same time, and paint them all at once, you should not be able to tell a difference.
Sand it down REAL good. Sand the plastic almost smooth. If you have ANY armorall or wax on there the paint or adhesion promoter wont stick more than a couple months tops.
Get some Bulldog adhesion promoter. This will make the primer/paint stick ALOT better to the plastic.
Prime it up real good
Sand it down
prime it again (lightly) and sand to make sure you didnt miss anything and got it all smooth.
Paint 2 or 3 coats of whatever color.
Here some people sand it lightly, with a real fine sand paper to get a finished smooth look before they clear coat it.
Apply 2 or 3 coats of clear coat. Here some people wet sand it ( i have no clue wtf wet sanding is)
Thats how i originally painted my vents, and how we painted my buddy's VW. The VW has no chips or anything and it was painted 12-13 months ago.