Growing up I was told by a few older wrenches of a local auto mechanic that "burned off his face" when working on a tire that had been reinflated with an aerosol. Seems that fix a flat (note the lower case) was quite flammable and when he leaned over the tire to deflate it for removal the aerosol ignited by the cigarette he had in his lips. The word "flamethrower" was used to describe the flame hitting his face. Ever since I had avoided this stuff when ever possible and have asked customers (when it seemed right) if they used an aerosol, before I did the work. Thankfully, I don't smoke either... Andy