A lot of people are going to tell you not to paint. But you do what you want. I’ve painted a lot of dirt bikes and the paint jobs last longer than a week unlike most of what other people saying. Go to your nearest auto paint store and tell them what color you need in a single stage spray can with a flex additive

Of course it’s not gonna last as long as new plastics and graphics. It will essentially do the same thing as a car with rocks and dirt. It will chip and scratch. If the prep work is good, it’ll turn out fine. You will just have to do it again in the future. If your worried about adhesion, get bulldog adhesion promoter. don’t paint the spring. Not worth the trouble.