Prep it well. Don's advice sounds great. Scuff it with a little sandpaper maybe.

Then a paint made for plastic, like bumper paint (flex ingredient should already be there). I'd see if one of these is a match: http://vinylpro.safeshopper.com/67/cat67.htm?279

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The Golden Rule

1984 300SD (bought new, sold it in 1988, bought it back 13 yrs. later)