Alright... Ill get a little list going here..
1. Remove all plastics from the quad... (obvious)
2. Sand them down with sand papper, (lighter the better) (make sure you
get everthing sanded that you want to paint)
3. Picked up some "KrylonPlastic Spray Paint", you can get it at any hardware store, hang the plastics from a tree or something and spray your first coat, wait 15 minutes... Spray second coat. (if you like how it looks go to step 4.. If not keep adding more coats untill satisfied)
4. Let the plastics sit for a day or two.
5. Pick up some clear coat spray paint and add a coat or two.
6. Let it sit for 4 or 5-ish days and put them back on.
Hope that helps, ive used mine for a while now and they dont scratch easily, you have to really want to scratch them for anything to happen.