Take a look at TCP Global tor some good deals on airbrush and compressors. I use their products and have good results and am pleased with the selection/price.
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Here's some photos of my color shift paint jobs on 53 P/U and 55 Panel using Rustoleum spray can, before I started using an airbrush (2018). I don't remember using primer. The p/u was molded in white and the panel was black. Have you tried decanting to use in your airbrush? I think I used only 2 coats (maybe 3) and got these results.
Hope this helps, looking forward to seeing how your's comes out.
You did great job on the RR, beautiful colors, finish, and detail. It was part of AMT Muscle Cars set, the Road Runner, 66 Fairlane GT/GTA, and 65 GTO. I'v built the R/R and the Fairlane
I'm sure we can work out something, do you want me to bring it to the meeting this month (7/20) or do you need it sooner? Have you got a 289/302 to spare? Let me know,
Lei