wetsanding is good enough. Are you doing them yourself? If not, let the shop decide. If there are any problems in the future, they should cover it. I know that I give a lifetime warranty if something I coat fails.
I bought a brand new set of painted wheels for my corvette to use for track wheels. I powdercoated them with zero prep, other than wiping down with alcohol. I would never do that on a customers wheel, but I like to test things with my stuff.
Through 3 sets of tires, changed out at dealership, and at least 15 track weekends, the coating is holding up perfectly.
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NISSAN: 75 280Z / 86 300ZX GLL /87 Sentra SE / 03 350Z / 23 Z
Porsche: 93 968 / 23 Macan GTS / 93 968
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