I tried that spray Alclad years ago and did not have good results, rubs off real easy. It's made to paint the inside of clear body RC cars than painted black over to of it. Alclad told me it was not for use over the black but I had to see myself.
I remember asking why the regular stuff didn't come in spray cans but don't remember what the reason was. Maybe they have changed it by now, would like to hear from someone using it.
You do have to wonder how they can sell the 1oz bottle for $8.00 and sell a spray can of 3oz for only $15.00
Airbrush VS Rattle Cans
I did think of another reason why the airbrush is better than the cans ... stripes. You can paint stripes on a model with almost no ridge on the edge by spraying at 3-4 lbs pressure, you can't do that with a rattle can.
I think anyone not willing to at least try an airbrush is missing out. You don't even need a compressor to try it, they sell compressed cans of air. I new a guy that used a portable air tank that he filled at the gas station.