its all in preparation...and refrain from walmart/dollar store paints as they will not last as long. prep it correctly...IMO
1. clean wheels
2(optional). if the wheels have paint, buy some aircraft stripper and spray them on the wheels and rinse them off to remove all the paint
3. sand the wheel down(1000grit and/or 1500grit)
- make sure the wheel is absolutely dry before spraying it with ANYTHING
4. spray the wheel with a paint adhesive
5. prime the wheel
6. paint the wheel
PS. when painting, spray light/multiple coats to avoid runs