Last year I painted the center section of the center pod to test whether Krylon Fusion paint would stick to the plastic. After a year, durability has been fairly good with no sign of chipping, or poor adhesion.
That being the case, I decided to do the whole bike. As of now, I've completed the center pod, and the front fenders. I'm ecstatic about the results...
Basically, what I do goes like this...
1) Remove the plastic from the quad
2) Remove decals, Clean it with dish soap and steel wool (00 or 000)
3) Wet sand out any deep scratches or high spots due to scratches (use 600 grit)
4) Wet sand the entire fender with 600 grit paper and mineral spirits.
5) Using a flame spreader on a blowtorch, lightly go over the plastic.
6) Paint within 1 hour of flame treatment.
7) Apply 4-6 light, but wet coats. Allow a few minutes between coats.
8) It will dry to the touch in 30 minutes or less, but leave it alone! It hasn't fully adhered and will come off unless you allow it to fully cure.
9) Wait 7 days for full, hard cure.
10) Wet sand using the following grits (400, 800, 1500). 3M wet/dry sandpaper is best. You can start with 800 grit if your painting skills are good and you have no drips.
11) If you sand through, you can touch up, allow the paint to cure and wet sand to blend the repair into invisibility.
12) Using a fast hand drill and a foam disc (as found in 3M's headlight restoration kit) and Meguairs Ultimate Compound, bring the paint up to a brilliant shine. Be careful around the edges so you don't burn through.
13) Apply new decals
14) Use your favorite car wax to shine and protect. I've found Zymol cleaner wax works best on the Krylon paint.
The good news with the Krylon Fusion paint is that paint repairs "melt" into the previous coats (like lacquer) making repairs invisible after wet sanding and compounding.
Wanna see the results? Check out the photos. The rear plastic is the original, unpainted plastic showing the inevitable scratches.