A couple weeks ago I stripped down my beater frame, primed it, and painted it with Duplicolor Automobile rattle can paint. It looks like a total sex machine now, but the paint is chipping pretty easily, and it seems destined to return to beaterland in the not-too-distant future.

I neglected to clear coat it, because the guys who sold me the paint told me that automobile paint shouldn't be clearcoated. I recently decided they was wrong and that I would put on a clear coat after touching up the scratches, but I've since gotten the same anti-clearcoat advice from two other paint shop guys. Do these guys know what they're talking about?

Since they probably don't...any suggestions as to how to clear coat it without taking off all the components? (not exactly a quick process, and I'd rather not repeat it)