Spray the rims when they are not on the car and make sure its not windy outside. If you leave the tires on make sure you put tape around the edge so the paint does not get on the tire. Use fine steel wool to prep the surface of the rims, then clean the rims before you paint them. Spray on light coats of paint, if you do to much at one time it will drip. You can always spray on more but you can’t take it off.