Not for modeling I do not wear a mask. Controal the air at less then 12psi coming out of the airbrush and if you have good paintbooth that is vented right you will never smell it at all. It's not like shooting a real car or the size of a hood or door! The thing to be more carefull about is not getting any on your skin then any thing.
I'm not well set-up I don't have a booth. I use my empty 2 car garage which fills with mist pretty often. The filters are always the color I'm shooting. I then blow them out and replace them every year or so. I never get paint odor with them on.