ED, If the BLACK finishes you want waxed are PLASTIC, please do NOT do it you will be very sorry. The wax will not buff off completely like it does on paint, and what it left in the rough plastic finish will turn light grey or white, and is very hard to remove. I have several areas on my car with black plastic, and every time I get a little excess wax on these areas, within a few days it is very visible. No if your car is black and you are having the paint done, I am guessing any of the at home detailers will do this.
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Pennsylvania, for 60+ years, most recently, Allentown, now TV. 
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