I've found that the Duplicolor rattle cans work well for me. Fusion Yellow is an exact match for Aeromarine yellow and luckily Fusion Blue exactly matched the blue of my old H&M Drifter. Since most of my boats will get raced, lots of battle scars show up and touch-up is easy with spray paint. Small chips get filled in by spraying into the cap & dabbing with the end of a paper match or cue-tip.
I really like the Fusion Metal Specs paint; it really covers up imperfect repairs. I use Fusion primer ( the color of the primer will affect the darkness of the color coat; it comes in white, red, grey, black, and hotrod dark black.)
Spray Metal Specs paint really dry for the most sparkle, and I've found that the DupliColor clear Enamel, rather than their clear laquer, covers better with fewer coats, looks deeper, and cures really hard to keep from peeling from tape. Just avoid spraying Laquer over Enamel, the reverse is OK.
2008 NAMBA P-Mono & P-Offshore Nat'l 2-Lap Record Holder; '15 P-Cat, P-Ltd Cat 2-Lap
2009/2010 NAMBA P-Sport Hydro Nat'l 2-Lap Record Holder, '13 SCSTA P-Ltd Cat High Points
'11 NAMBA [P-Ltd] : Mono, Offshore, OPC, Sport Hydro; '06 LSO, '12,'13,'14 P Ltd Cat /Mono