Is Fix-a-Flat a Dangerous Product?

Every time I read something about Fix-a-Flat, a bevy of mechanics, tire techs and other doomsdayers are there to tell you how dangerous a product it is. I have one word for them: WRONG. They claim that the propellant used in Fix-a-Flat (and similar) products can cause an explosion when a technician goes to dismount the tire for a proper repair. The story goes something like this: By Matthew Wright, About.com Guide