here's the best way to ensure a good paint job:
LET
IT
DRY.
let it sit for a day after you prime. after you've done the color and the clearcoat, let it sit a week. yes, a WEEK. don't get impatient and paint Saturday afternoon then build it up Sunday morning-- it needs to harden!
I'll also add that while Duplicolor is nice, the colors are totally boring. Think about it: bikes are usually more colorful than the average factory-painted car. Duplicolor is made to touch up cars...so it follows that it's boring. Beige with a little sparkle? They've got five different shades. The color of blue you'd expect to see used on a "country" themed interior wall that boasts goose-shaped stencils with little bows tied to their necks? I bet you love that color blue, and I bet your mom owns a minivan in that same damn color.
Painter's Touch (available at many hardware stores, home despot, etc) has decently cool colors and works fine if you're patient.