I've used Preval bottles in the past. Like stated above, a detail gun works better. That said, the Preval was quick, easy, and you can mix your own colors.
+1 on using quality auto paint. Also, prepping the frame well is extremely important for a good finish.
Dr. Deltron seems like the guy to talk to about all this.
I used House of Kolor paints for the most part.
Just in case anyone wanted to see what it was exactly..