Excellent step by step Copenhagen1. Thanks for this.Get some maroon Scotchbrite pads and some Dawn dishwashing liquid. Put a little soap on the pad with water and scrub the face of the wheel. This scuffs the surface and degreases. Rinse and let dry thoroughly.
Next wipe with lacquer thinner or brake cleaner if you don't have thinner. This gets all the lint and dust off.
Then lightly mist a coat on. Read the can and see how long to wait before second coat. Wait the prescribed time, then lightly mist a second coat. Wait the prescribed time again and put a really good third coat on making sure you cover completely but not so much as to cause a run.
If you want it factory correct, just paint the face, not the rest.
I am pretty sure the black coating that came on your new wheels is not powder coat. I am pretty sure it is just a real good primer. My wheels were original disc brake wheels but I only had 4 of them. This one was a brand new one when I bought it.
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Good luck.