A bodyman I used to work for years ago taught me a trick to apply touch-up paint flawlessly. Use a cardboard match stick. Tear one out of the pack, and use that end to apply the paint to the chip or scratch. It will "flow" right into the defect, and level out to a nearly perfect repair. If you wanted to get really nuts, you could let it cure completely, then block wetsand with 2000 or 2500 grit to level any high spots, then buff it back out to a high gloss.
Most the time I never have to do that...It usually turns out so nice you really have to look to see where you painted once it cures.