Tamiya liquid surface primer

Thanks for the replies guys. I'll give it a go this weekend

I have used it as well. I thin it with generic hardware store lacquer thinner, also a a 1:1 ratio, and it airbrushes just fine. I cant tell you the PSI that I use, becuase my compressor has no PSI guage, only a valve to increase or decrease the pressure. But it works really well I must say.

In my experience, it's the most foolproof primer.  I thin it with Tamiya lacquer thinner to a 1:1 ratio & shoot it @ 20 psi. Because it adheres to plastic extremely well, you don't have to worry too much about surface prep.