All depends what pressure / strength the blast media comes out at.
A few years ago I had a set of MR2 alloys done and when I picked them up the whole wheel looked like a rough sand cast finish!
It took me ages to polish up the spoke faces back to what they were.
The place did mostly structural steel work and must have been blasting large chunks of grit at the wheel.
Also just had a set of Lexus 5 spokes done (in a different place) and I spoke to the guy about my concerns. He dipped the wheel in chemicals to take off 80% of the paint and lacquer the gave each wheel a light pass with the compressor turned down to minimum pressure.
A much better result - still needs a little flatting before painting.
Been told to use an etch primer to start with for b etter adhesion.
Be warned that polishing alloys to a 'chrome like' finish is very,very time consuming. Large flast face can be done OK but spoke edges, rims etc can take for ever.
JB
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