well if you are going to use spray paint figure an error isnb't going to cost all that much to redo so don't over stress it.

Buy the paint whever you want. I like the industrial Flat black at home Depot.

Strip the wheels with aircraft remover or paint striper that can be found at Autozone.

Make sure the surface is even and clean. Spray evently. This is most easily done with the tires off.

Trey