Personally, I think you should show some love for the airplane and do it up in high quality automotive paints, BUT I know I know, they are expensive, and a hassle to mix, and you need an air gun, etc...
If you are going to use a can, take the time to prep the surface properly. Wet sanding with 600 grit has worked well with me in the past with Krylon. Never spray in really humid weather. Heating the can is an excellent idea, so is a tack cloth.
I have seen some jobs where people have wet sanded with 1000grit or better and then over shot with a good (pPG) clear coat.
Often, when a paint shop shoots a car, they have to make up a large quantity of it, and almost always have junk left over. Drop in a few shops and show them your plane. I'm sure you could get them to help you out.