I'm thinking about buying a spare set of wheels and tires. 3 of the 4 rims are in good shape but the 4th has a nice sized gash. It doesn't have to be perfect, but are there any good methods for touching something like this up? Do I have to worry about salt ruining them, as far as getting under the paint or whatever? Not sure if I want to use these in the summer or winter. I wash the car regularly. I think I may sandblast my current wheels and powder coat them.