BTW I Clear Powder coated the Aluminum wheel.. Which took away a little of the bright shine but it's very easy to keep clean now.
The Stainless steel rotors don't need any coating to protect.. just a yearly buff with mag cleaner.. I even buffed my nuts! (rotor)
Bad thing about Clearcoating over Alum. is if you scratch the clearcoat all the way to the surface it will begin to corrode the alum. underneath the clearcoat. Then you have to start all over. IMHO, it is better to leave the wheel au-natural, and just keep them clean and sealed with a good wax. If you are doing all the work to polish them, then I would think a little cleaning on a regular basis wouldn't be out of the question.