I was going to comment about fire hazard and paint booths. Common sense is the best safety equipment. As the other comments stated, stupidity leads to accidents and fires. The standard spraying operation is not all that dangerous. Think about it. How much solvent would you have to evaporate into the air to achieve a volatile air/fuel ratio? As long as you have airflow through the spray area, you shouldn't have a fire hazard. That is, if you don't light something on fire in the process.
Keep a good fire extinguisher(s) near the exit(s). Why there? So you can decide whether to go back and fight the fire, or RUN!
Reflected edges in the sprayed surface are the best way to determine wetness and flow. I've seen PDR guys put lines of tape on their fluorescent lights, so they can see the surface. When setting up paint booth lights, make as many edges as you can. Photography lighting uses diffusers to eliminate hard lines and shadows. We want the opposite when we spray.