just use spray paint that are used on cars they make it look smoother
The spray pattern from cans is a circle, which will make the possibility of runs extremely high.
Best bet, get a spray gun and compressor. Use a vertical spray pattern, the lighter the better... but not too light or you end up with colored dust instead of a painted finish. Multiple coats allowed to cure at least a day or two (indoors, away from flying insects...).
Buff out the top coat after it has cured a few days, then apply several layers of clearcoat (allow to cure as the paint between each coat).
No, it is not a quicky job to do it right, but it is worth the trouble when you see the finished product. In fact, if I can talk my father into it, i am thinking of he and I going into this business. He was a painter for about 40 years, and has all of the equipment and know-how. I just wish I would have listened and paid attention all those years ago...