The simple way to ease worries is to use
Rosco FlameX P50. It comes in little bottles that you mix directly into your paint, it is not supposed to affect any colors you may have mixed, and you use one bottle of flamex to one gallon of paint. This creates a fire retardant coating when you paint. There are three other flamex types that you can use for treating raw materials, you can read about them
.
As for pyro type situations, flame retardant generally isn't enough to pass the fire marshal's inspection. Most of the time if you are using open flame, even a candle you need to have some form for flame-proof flashing like a sheet of metal