I ran out of MEK substitute for thinning, so had my wife stop and get some on her way home, and they didn't have any substitute, so she got the real stuff. One look at the label, and looks like I need to return it and find the substitute. It says extremely flammable and sinks, so not going to use it. Have to put this on hold until I can find the stuff I have been using as it is not nearly as bad.