Painting ???

Ok. Its not my prefered choice but hey if you gotta use it you gotta use it. If its raw aluminum i agree with above. spraying them with etch primer is your best chance of adhering to the aluminum. Clean the area to be painted using a non lint cloth with denatured alcohol or a wax and grease remover. Spray light coats of etch primer Covering the area to be painted completely. Then scuff lightly with a scotch brite pad, clean again with wax and grease remover or wash using dawn dish soap, allow to dry completely before taping to paint. Ive seen wheel paint at the pairts store. Never used it though