I have powder coated rims. They shop that I mentioned patch up the rim with epoxy, polish and spray paint. Depends of how serve your rashes are. If minor, almost like blend new after repair.
The other finishes such as polished or brushed may be more difficult to repair.
2011 F10 528i Black Sapphire / Oyster Black
2000 E46 325ci Cabrio Titanium Silver / Black - retired
1997 E36/7 Z3 Montreal Blue / Black - retired