Overspray is simply aerosol spray from spray equipment somewhere you don’t want it to be.
Airbrushes always create overspray.
There are actually two different kinds of overspray.
When spray equipment creates an aerosol it atomizes the liquid into tiny droplets of various sizes. Some of those droplets are small enough to become subject to something called Brownian Motion.
Brownian Motion basically means that particles ‘float’ with air currents instead of falling with gravity. It’s like the dust in your house on a bright, sunny day. It floats and hangs in the air and slowly, very slowly, settles.
This ‘mist’ of spray is the biggest safety concern anyone using spray equipment faces. Period. You breathe it. It settles. You stir it up again. You breathe it more.
You wear your mask or respirator.
You seperate your work area from other living areas.
You ventilate your work area very well.
You might even wear special clothing to keep the paint seperate from you.