My dad had this given to him by a friend and the very next day he got a puncture. He had to be somewhere quickly, pulled this out and used the whole can. Not only did it fill the tyre without having to remove it but completely mended the puncture. He has been driving on that tyre for 3 months now, so definately a winner. I am about to buy 2, one for myself and my wife, but thought it needed a bit of a big up.