A flammable liquid ketone used as a solvent and a constituent in many aircraft finishes. Like MEK, acetone is quite universally used as a cleaner. It is used to remove lacquer finishes and for clean-up after painting. It will soften acrylics or lacquers that have set-up in spray guns or hoses. But, it has little effect on polyurethane which has cured in the gun or lines. When buying acetone, be sure to get only virgin acetone, as recovered acetone is often so acidic that it can damage anything on which it is used. Gallons require hazardous material fees. Quarts and gallons must be sent UPS ground only.