aaah right,
problem with the nail art kit is that the nozzle on the airbrush itself is very fine and as such may not be suitable for anything other than very thin inks. So long as the airbrush itself comes with a 3mm nozzle you should be OK.
pluses with these is that they use a continuous blower and you dont get the water build up that you do with a compressor. Minuses are that you may not get the pressure you require to spray paints.
There are better ways to get what you need - a 2.5hp compressor for $99 at supacheap will do you OK - this also comes with the hose and attachments. Then all you need is a DUAL ACTION airbrush, dont go with a single action, dual allows you to adjust the paint flow also. I also dont like the grav feed airbrushes, they can be messy to work with if your paints are not thinned right. A suction fed allows you to take off the paint jar, adjust and reattach.
I got my airbrush plus 1.5mm and 2mm needles, air flow regulator etc for $89 off Ebay - is a great little brush, was sent from sydney and i had it within 2 days of purchase - look up ROYAL TINT. They do have an Ebay store.
Good luck - gavin