I too have had bad results with powder coated wheels.
- They coated the inner index hole, i had to sand the crap out of it to get the wheels on.
- The back mating surface of the wheel that mates to the hub needs to be flat. I had to sand that too to get down to metal
- Sams Club did not protect the wheel or put the center cone on backwards when they balanced the new tires (Wheels only had 1 year of use) and all 4 wheels came away with gouges.
- The lug nut hols are all chipped up
- And there is an odd wrinkling on some of the centers.
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I say paint. As noted by j_anderson, much easier to repair
And yes they were done by a profesional shop, and sandblasted first.