PRACTICE...
Its not the same thing as regular spray paint. If you don't know what you're doing and aren't used to working with it, it can come out terrible.
These are my wheels, a custom carbon gray sprayed with a gun, and its smooth to the touch. Yes, really.
Some rattle can rough job with black is not the same thing as a 'professionally' applied job that is 100% peel-able.
I plan to change the color periodically, good luck doing that with spray paint or powder coat
