Yes they can. PPG makes a special clear coat for polished alum. The wheels on my old Chevy in my sig are polished Centerlines I had coated last May right out of the box. Awesome shine, and I just clean them with a sponge and hose when I wash the truck. Still wasn't comfortable running them in the winter up here in the salt belt, seen enough f'ed up factory clear coated wheels with the way they throw that crap around here. Be putting them on my new (to me) Gmc around the end of April. Good luck, Jim.