I've used that Aztec paint a few times. It actually sticks to bare plastic pretty good, but you should scuff the plastic with some 800 or 1000 grit wet/dry sandpaper. After its sprayed, you can 'set it' with a warm blowdryer. I used about 18 psi on the compressor, and thin coats. It doesn't like to be sprayed on too thick. It will dry to a satin finish, so don't get wrapped up in trying to get a good gloss coat. It needs clear.