In some applications, overspray can be collected for reuse. Wet booth may work to your advantage if overall paint volume can justify the investment. Wet booth eliminates disposal of filter media and allows waste to be reduced in weight and volume by separating the paint from the water through settling, drying, or using a centrifuge or cyclone. Consider the nature of the contamination, the substrate to be cleaned, and the degree of cleanliness required when choosing an alternative. Although toxicology information specific to these chemicals is relatively limited at this time, it is believed that the relative safety of similar chemicals means that they might be viable alternatives to organic solvents in certain applications.
Acetone use is a gamble.
It is extremely flammable and therefore is a serious fire hazard. A tiny spark, fueled by acetone, can generate a blazing inferno. Consider alternative coatings to the traditional organic solvent-based coatings. Check out CAGE , the Coatings Alternatives Guide which addresses plastic and metal parts coatings. High-solids has a high percentage of paint solids and a lower percentage of solvent carrier.