If the guy doing the polishing doesn't know what kind of metal/material he is dealing with, it my be best if you find someone who really knows what they are doing. If he messes up your wheels, you are likely to be very upset, and you probably won't want them back on your bike messed up. I don't know about you, but if my bike is not looking the way I want it to look, I won't ride it. There is nothing worse than being on your bike, riding with others, and knowing that your bike looks jacked up. Bad looking wheels really stick out like a sore thumb...especially when the bike is parked.