you can paint newer rims too, just sand them with like 400 grit, and then scuff them with a red 3m scotchbright pad with scuffing paste..
powder coat and real paint are only different in process, the final product is about the same.
(people tend to think powder is harder than paint, and it is compared to most, unless it is properly cured real auto paint)
pinstripe tape will not work very well.