Towns here have residential HAZMAT twice yearly. How do you get rid of house paint? One method is to pour it over objects, let it dry so the solvents evaporate, and dispose of it in the recycling center dumpster. When doing demo work, that is what the refuse companies tell you because they do not want paint cans filled with uncured paint thrown in their roll-offs. Lacquer thinner will eventually evaporate, leaving the solids behind; no different than when using it or any reducer when spraying. You can throw a little in 5 gallons of waste oil too.