DIY paint booth fan question

Not an expert at painting, just worked with the stuff for 17 years. Mainly 2K urethanes, some chromates and epoxies. None of it is safe....... As far as respirators, KEEP MASK SEALED IN SEALED PLASTIC BAG WHEN NOT IN USE!!!!! Reason being that it will pick up solvents even when not in use on your face, and respirator should use a filter cartridge. The dust thingies will not protect you, only from dust if it fits well. Replace cartridges after every use, safest policy yet, yes it gets expensive but better safe than sorry. Cartridge should be the activated charcoal kind, usually black in color/black stripe.
Another thing that was said, the fast dry to touch is the best! Does not give time for the crud to stick. Stuff I used was for aircraft that had a very long wet edge, film stayed open for hours. See, it takes at least 8 people to paint a 737, up 12 or more for a 747. Not as long with a car. Now, get to painting!