Two-Tone Layering Question

Is this what you're looking at?

http://tcpglobal.netsuitestaging.com/s.nl/it.A/id.146880/.f

It's single stage, hardened, urethane, and should hold up ok.

Yes that's the one I saw. I;d like something that last a little longer than 5 years. Unfortunately the car lives outside. I don't have a garage. The old owner had it painted by in his words "guy turned out to be a drunk and took 6 months to paint it, finally I gave him $500 to do what he could, hurry up, and give it back" and it was ok, because it lasted a little while and looked nice, now the quality is showing. People comment going "nice car" and stuff. And it is, but in my head I can't get over the peeling thing, it's driving me nuts.

Anyway, yes, I would ideally like to do single stage. Would packing paint on make it more durable? Or would that just make it more likely to chip? Say 6 coats or something. Or is the idea to stop once the paint is fully covered? I've only ever done base/clear - never single. I have a folding car spray booth that im borrowing, placing outside at my shop, and then I'll hose the ground down to do it. I have two gravity guns that I used about 6 years ago to paint a '68 Porsche.

Is there some other paint i can buy in that color that's single stage or is it only base/clear? At this point if the line layer can't be gotten rid of, I'm ok with that, and it seems like I'd want to do the black after the purple I think.

I know I'll have some holes to fill anyway as I plan to take the trunk panel off, and there will be holes there as well. Th last time the car was painted it wasn't removed so it may be all nasty under the panel.