I know that Old Yaker & Chuck already know this - others may not. ACETONE IS FLAMMABLE TO THE POINT OF BEING NEARLY EXPLOSIVE. It also is injested into the body if it gets direct contact with skin.
Be very careful if working with acetone. No open flames or pilots around. Stay away from things such as gas furnaces, gas water heaters, gas dryers, electric heaters, etc. Work outside in a fresh breeze.