I hit all of the plastic (and the "decal" trim under the windows) with Forever Black. Works a treat... but takes several "coats". Get a lawn chair and a 6-pack, then work your way around the car a few times. Still looks great 3 years later.

-Ryan
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Athens, Ohio
1987 245 DL 324k, Dog-mobile, E-codes
1990 245 DL 137k M47, E-codes, GT Sway Bars, GT Braces, Dracos
1991 745 GL 304k, Regina, 23/21mm Turbo Sway Bars
Buckeye Volvo Club

Spirit dye for leather works GREAT on the black trim on our cars (and mirrors), and you can buy it by the quart. In fact, judging by the consistency, physical characteristics, smell, etc. I'd say it is exactly the same thing as "Forever Black" trim dye which is quite a bit more expensive.

Dye, then condition with some kind of trim dressing, or my personal favorite for almost everything: Johnson's paste wax.

The colorant is in the plastic, so, dye.

I used dark gray dye on the lower door trim molding and it looks great, so I'd imagine that black dye would work as well on the (formerly) black bits. But in the past I have had excellent results from using plastic/vinyl-safe spray paints, so your mileage may vary.

Also, clean the plastic with IPA (99% isopropanol) or some other non-oily cleaner before dyeing/painting.