Well I am fairly familar with automotive painting systems, and have painted multiple cars, bikes, trucks, suvs, boats, etc. But you're are looking for a spray bomb, not a single stage, or base coat/clear coat applicant. So that makes it much more difficault to find. Ever consider Plasti Dip? its reletivly (sp) cheap and fairly easy to do. You can do it in spray bomb ( rattle can) or through their spray gun. Comes in a multitude of colors and can be tinted. I understand you went to the local parts store looking for paint, but IF you are serious about it and really stuck on spray bomb ( im assuming for affordability) I would try a store that actually specializes in automotive paint, as the also carry spary bomb and can probably color match for you. But I would look into Plasti Dip. Its probably going to run you the same price if not cheaper and from what i've read will hold up better to the UV light and daily driving over spray bomb. Just my $.02. Hope this helps.