Cool idea. I have two of these in the stash, and one of them is destined to be a hauler also (and the fire fighting stuff transferred to a Ford C-600). I think the A LaF would make a neat hauler, but I'm having trouble coming up with a suitably cool race car for it to haul. Looking forward to seeing your project once it gets underway.
I may be quite wrong, but I am under the impression that Zero paints are a lacquer, and a somewhat hot one at that. Is that true? If so, all the more strange that it doesn't 'bite' the plastic. Your application process seems good.
A little more detailed info on this 'blow back' problem would be helpful. By 'blow back', are you referring to bubbles in your paint cup. I am not familiar with the Paasche Talon, but on many airbrushes this is an indication the head or nozzle seal has been compromised.
Just catching up to this build again. Fantastic detailing, Daniel, and an excellent display of craftsmanship. Everything is looking brilliant. This thing is going to be cool!