The key to this steamer pot is to unplug the power when the acetone has started to boil off. Then spin the steamer on a turntable to swath the vapor around. There is no "Off" setting for ours so we unplug the cord on the steamer end which is the most convenient thing about this method.
DO not do this method in a closed room, this is not the kind of stuff you want to get high to! Also try to not get the acetone on your hands or cloths. I am sure you have heard it all before but it is always best to be cautions.