If you want slick pain't you may want to try my method. It's simple, cheap and doesn't stink the place up. I use acrylic craft paints from hobby lobby and Walmart. You can get these for less than two dollars a bottle and one bottle will paint at least ten bodies. These now come in pearl and metal flake colors as well.
My spray formula is any single or dual action airbrush with #3 or #5 needle will work as long as the airbrush is clean and operating properly. I use a Paasche talon dual action.
Air pressure needs to be adjusted to each batch of paint. I spray anywhere from 20 to 30 pounds depending on my paint and what I'm spraying.
Thinning paint. I always mix my paint half paint and half Pledge floor finish so you end up with a fifty fifty mix.
Turn your airbrush down until you get the flow you want and spray light coats making several passes around the body. You can practice spraying on plastic spoons to get use to it and tell how its going to look. No need for clear because the clear has already been added to the paint. If you want s super high gloss finish you can spray straight Pledge floor finish over the body after paint has cured.
The draw back to using acrylics. They dry very fast so you will need to wipe the dried paint from the end of the needle from time to time if you notice your spray pattern changing or if there is a lack of spray.
Here's one I sprayed a few weeks ago and it has no clear on it. I sprayed straight onto plastic with no primer.