I've painted quad plastics twice. I am fortunate enough to be in autobody business so I have all the right struff. The only thing that will really look nice is a base/clear system. I used Dupont once and just painted mine with Standox. Your local paint store that supplies body shops can give all the right materials and tell you what to use. all the paint systems have flex additiives that go in the clear and primer(if Used) that allow for flex. I just rolled mine in the sand 2 full roles and didn't damage the paint. The big thing is to prep them thoroghly, especiallly if thier used. If heavy scratches are in the plastic youll probably have to prime and resand before you can paint. This can be a challenging project but very rewarding, hope this helps.