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Lots of us have done it. Sand it good 1st to smooth it a bunch, then they make a plastic adhesion primer to help the paint stick. After that I'd get a coat or two of primer on it, and wet sand them until smooth as glass.
I went to auto paint store and got a little kit that uses aerosol and they mixed an exact match for my paint....it's pretty ez. Clear it afterwards and eveyone will be astounded how nice it looks.
Have fun
I just did mine last weekend & it wasn't to bad, hardest part was the coolant tank removal. Make sure you use a good plastic primer and sand it good, I started off with 400 grit then 600 & 800, I only did a little wet sanding. As far as color match you can get all the colors from GM for approx $7-$8 a can, that's a 6oz can. I used Dupli color as they make GM colors and its $4 for a 12 oz can. Take your time and have fun & take pics! DIY rules
I did mine! Sanded then painted with a plastic reacting paint..found at most auto parts stores.. auto zone, advanced auto , Pep boys.. then I cleared them with VHT 1200 F clear coat.
I'll make a deal with you, you come hear and I'll do it!
EHHH??? What did you say?
Seriously, the only thing I would add to this is if you can't find a plastic paint that matches, get a touch up paint, and use a Plastic Primer before applying your matched paint. (Plasti-Kote #469 is Plastic Primer.)