I'm using a bunch of different ones.I find most stick well as long as I use the Stynyrez primer from Badger on the plastic and scuff the plastic first. Probably Liquitex soft body bonds best but I haven't had much trouble with FolkArt either and they have a ton of colors to choose from. The key is thinning, primer coat and sealing. Most anything can be sandwiched between the primer and sealer as long as it's compatible and sprays on smooth.. I'm using stynyrez primers, I find this to bond pretty decently to scuffed plastic, then any acrylic paint pretty much bonds to that primer. Top Coat this time was clear lacquer but next time I think I'm going with Liquitex Gloss varnish, it sprays on like warm butter on hot toast and requires very little buffing. I was using the satin in this stuff for my wife's ceramics, it mixes in with acrylics to make various sheens but is also a top coat. In her case we used it to seal and protect but it's a dream to spray. I just recently got a bottle in gloss,. I use Micheals rewards cards and get 40 or 50% off coupons and that is when I buy these more expensive Liquitex finishes and additives. Liquitex products are made to airbrushed, all but the heavy body airbrush very smoothly and bond well. And the additives can be used in other acrylic paints.
I could go on and on talking about paints so I'll stop there lol !