I don’t want to throw a monkey wrench into the discussion, but it takes no longer to learn to get good results with craft paints then it does to learn to get good results airbrushing with any paint.
Even model paints need to be made to the proper consistency to spray properly, and practice to get a good coat without runs, etc…
Although, you would have to use either Flow Aid, or the specially designed acrylic thinners, otherwise the craft paints tend to separate if only distilled water is used…
A good consistency to aim for is 2% milk.
And, making sure that you get good coverage and no runs takes practice. No more than using any kind of paint though. Once you learn how to airbrush with one paint, any other will also work.
Just make sure proper technique, and consistency, is used, and you will be able to use any paint needed. Some require different thinners, or different clean up, but, all need proper airbrushing technique, and consistency of paint to spray, and any paint (to an extent) will work.
Note: In no way am I saying that craft paints work better than model paints, as model paints have their place. I use Modelflex, and ModelMaster Acrylic’s on a frequent basis. I also have Vallejo’s Acrylic surface primer as my go-to. So, yes, model paints have their place in your painting arsenal.
But, I am saying don’t overlook craft paint as being in your arsenal as well.
And, for those looking for a dead flat paint, craft paints are just that. They dry dead flat, and stick to almost anything.
Don’t overlook them only because they are cheap, or because they take work to use correctly.
Yes, airbrushing with craft paint takes practice, and they need to be mixed properly, but airbrushing with model paints takes practice, and need to be mixed properly as well.