Yes they can be repaired.... I had mine done, and the repair is flawless but the paint peeled after I tried some different wheel cleaner. I am not happy at all with the factory coat on the 10 spoke black wheel, so I am likely going to have the set powder coated.
2012 ZL1 #213 M6 Black on Black
2013 ZL1 #2638 Convertible Auto
2010 Chevrolet Suburban
2011 GMC Seirra HD Denali