If you did this with Krylon paint it wont work, you need CAR PAINT, etching primer and primer for aluminum and sand that pretty good, take the rim off the wheel also. The excess or dust in the paint needed to be sanded with wet sandpaper. But anyhow, with krylon or any paint that is not car paint it wont hold even a week w/o having scratches because those ones need at least a month to cure.

GO to your car paint supplier over there ask for car paint in can (they can put the paint in spray cans for you), ask for black "base coat clear coat," look at the web for a color code from a black car and use that code. With the primers asks them for primer in cans for aluminum also or you will end up probably with half a gallon of primer and needing to buy a gun and a lot of stuff more like clear coat, reducer and hardener. Buy a mask, car paint is really toxic.

Good luck.

ps: sand the rims to the bare metal, secondly, black is the hardest color to paint because u cant hide imperfections with black.