Grey Primer

I'll use spray paint gray and black on my bike with Prime stickers and varnish. However, how many gray primer, black spray paint and clear coat do I need. I would appreciate suggestions for good.

I think 2 cans of each would be nice. For best results, I'd do a couple of light coats of primer and two paint for more results. Even if it takes a few days. Let dry completely between coats 12-24 hours.

I would even make a clear coat of sealer after the last layer. Or after drying, apply a coat of car wax or Armor-All.