If you decide to do any of the catalized paints just be sure you know what chemicals are in it. Some of them have Isocyanate, which is basically cyanide. If it doesn't have any in it you can get away with good ventilation and a good cartridge respirator. If it does have the Iso in it, you need a fresh air system as apparently the cartridge respirators won't filter it out.
To keep from going off the topic the OP originally posted about I'll admit I haven't used any of the rattle can epoxy paints. If however you are interested in some info on using the Urethane paints through a spray gun, I am posting a how too in the Tech forum, and also have a little bit of info in my build thread in the Project forum. The Urethane 2 part clear is too die for. Even unpolished it looks super!
Brandon