testors one coat lacquer in Tips, Tricks, and Tutorials Posted February 14, 2011 If you use DOT-3 it won't harm the plastic, but DOT-5 might melt it from what I heard. Also, what paint did you use? If you used the hobby paints (Tamiya, Testors Enamals/Lacquers, Plastikote and Valspar odds 'n ends), it should get it off in about 2-5 hours depending on the how much you put applied on. If it's automotive/hardware paints (dupicolor, wal-mart and other hardware paints), expect it to come off in about 5 days to 3 weeks, again depending on the coats of paints you applied and the time you did them. If their clear coated, it may take a little longer.