I just waxed mine over the weekend and it looks fine. I am pretty sure it is painted plastic and even if it isn't, the wax did add some shine to it. BTW, my car is silver. Check out my pics in the KC forum to see.
Rick
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Buckshot77@AOL.Com
2000 Contour SVT
Silver/ Midnight #1611
Born on 1/14/00
Borla, KKM, Upgraded Fogs w/ Parking Lights, heavily leaded right foot
Des Moines, IA
New Motor @ 20,959 miles
Born Again 2/21/01 (definitely not a Christian car though)