I know, I know but the whole process is sort of addictive-you can't stop once you get started. I don't have enough experience to give you advice on paint. You might ask this guy what he ended up using.
Painting the Grizzly Uke kit
As a newbie uke finisher, my advice about spray painting still stands. I followed the directions on the can and ended up with drips which I had to sand out. Start your spraying further away than the directions advise and move in.
I know it is a $20.00 beater but you want people to look at it and say "Wow you only paid $20.00 for that?" instead of "Luckily you only paid $20.00 for it!"