Acrylic paint fire hazard?

I'm not sure if that's true, but I don't use Testors, I use Tamiya, and they have a fire hazard sign on their label.

Certainly if you are adding alcohol (and that includes Windex and Windshield Washer Fluid), it ups the fire risk.

Which in reality is quite small, however I do recommend that if you are making your own booth to find an non-sparking fan!

No they are not flammable unless you are thinning them with alcohol or something flammable for thinning to airbrush with them.

They almost always need some thinning though so you need to think about that aspect unless you can get away with straight water which I had no luck with. 

Those paints are tough to get spraying reliably through an airbrush no matter what you do in my past experience with them before switching to Tamiya.