Are you painting styled steel wheels? I just painted my styled steel wheels for my eliminator. I had them stripped (acid dipped), primed them and painted them with Eastwood charcoal grey paint. Turned out great. If you're painting grey, I have 2 cans left if you're interested. 2 cans is more than enough for 4 wheels.
That is total cost. Remember, when you get them back they're bare metal with a light coating of rust inhibitor. In the winter you can go about a month before they'll start to rust. In the summer when it's humid you get about 1-2 days, so be ready to prime. To get the inhibitor off you just rinse with water. I use a pressure washer. It beats picking sand out of your hair, teeth and every other place on or near you.
That's the color gray I have if you're interested.