If you are painting wheel covers you don't have to do any masking. Just lay them out and blast away. If you are using a basecoat clearcoat system, you must clearcoat. If not, just use the paint you have. You can clear a one stage system, but it takes a special procedure.

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95 SL500 Smoke Silver, Parchment 64K
07 E350 4matic Station Wagon White 34K
02 E320 4Matic Silver/grey 80K
05 F150 Silver 44K