These are from Createx, they explain some things you need to know before buying anything...
-Createx Airbrush Colors™ are intended for
interior application and
require heat for final
curing. Wicked Colors™ are intended for both interior and exterior applications
-AutoAir Colors™ are meant to be top coated with a
durable, urethane clear. Auto Air Colors™ are compatible with all urethane, waterborne and water-based paint systems.
For use with lacquer and enamel paint systems, test first.
I want to start with explaining that I tell you this only because I have tried to do things like this without having the money it takes to do it the right way. When they say "meant to be top coated with a durable urethane",
they mean it. You can't expect a single stage, general purpose paint to be the same as a high quality 2 part urethane. When they say "test first"on lacquer or enamel, it's because it could melt the paint on your car into mush. As far as the paint you left the link for...I've tried a lot of different spray paints and primers. Through trial and error, these are some of the things that have happened using general purpose paint instead of automotive grade.
-I have had hours and hours of airbrush work melt into nothing after I sprayed the spray-can clear.
-The area I cleared was twice as shiny as the paint around it and looked very unprofessional, so I color sanded and polished the rest, only to have a "halo", or foggy ring around the edge of the new clear.
-Other things looked fine at first but later, the clear turned yellow and cracked on top of my artwork.
-I've had to pay out of my own pocket to start over from bare metal, after the three different paints(the paint on it and my artwork, and my clear) reacted chemically and turned into a soft, wrinkled, sticky, mess.(again hours of airbrush work, wasted)
-I have tried a bunch of different brands, and have even put things in my oven at home to heat set the paint, in the end it was never as good as I wanted. There is a reason that professional custom painters, or even auto repair shops don't use spray-cans. I'm not saying it's impossible to get good results with them, but it's more likely that it could go wrong.
Eventually, after ruining enough things, I found someone to let me use there autobody equipment to do it the right way. That is what I meant by shooting clear in a garage... with a full size spray gun, and 2 part clear. Now, if I can't do it myself, I take it to a local paint shop and have it cleared by them with a
good paint. Besides it never hurts to show them that you can airbrush.
I don't want to sound rude, honestly, but if you want the car to look professional and have it last a long time, you have to use automotive grade products and equipment... that paint you showed is meant for small objects like a mailbox or lawn furniture that you can cover the entire piece...not an area on a car. And it's not a quality urethane, so it may react badly. It may seem expensive to use "the good stuff" or to pay to have it cleared by a shop, but it's really the only way to be sure you'll get great results every time. A nice paint job will give you a reputation in your area...so will a bad one.
In my experience, if you want high quality results, you need to use high quality products and equipment. You can get away with cheap paint on things around the house that you want to airbrush, and it gives you an idea of what your work could look like if it were done on a bike or car... but it's not intended for quality automotive work. There are a few high end paints that come in a spray-can, but they are quite expensive and all are intended for smaller projects than a car.
Again this is intended as a warning, not an insult. I see you heading down a road I know very well,

.:smile-new: I'd check with a local paint shop and see what they would charge you to clear coat of the entire car, once you've airbrushed it. You may even get some airbrush work...