I coudn't do any better on my initial response.
Acrylic paints that have been aerosolized most certainly are NOT harmless. You need to take similar precautions when using acrylics that you would use for enamels or lacquers. Any pigments that you spray have the potential for harm. A little common sense goes a long way, and keeps you off the pulmonary wing of your local hospital. - Ed
"There's no problem that can't be solved with a suitable application of high explosives"