I've gotten great results from rattlecans as people are describing, a couple medium coats with dry time between, then lots of dry time, fine sanding, and a final wet coat. even rattlecanned a buddy's camaro hood with several days dry time, color sanding and clearcoats over. not "perfect" but a whole lot better than before, and a whole lot better than he'd thought possible too, it's a technique thing and conditions (temp humidity) are a factor.