4 Cans of Duplicolor engine enamel (I don't know the color name, but it looked like a gun metal grey when I bought it. But it didn't by the time I got finished.)
2 Cans of Duplicolor engine clearcoat
2 Cans of rustoleum primer
2 or 3 coats of primer, sand down with 350 grit, 2 coats of engine enamel, 2 coats of clear.
The wheels looks like a dark grey in the shade or indirect sunlight, but when the sun hits them they look like this. I'm pretty impressed with the outcome!
Total cost :$55