My Accord got a puncture yesterday, a split across the tread and part way down the side wall so new tyre needed. But it made me think, mine doesn't have a spare and so if this had been a normal puncture and I had to use the repair kit and pump does this have a shelf life, Would my unused 2003 reapir kit be useless anyway. Also does using this kit kill the tyre and make it unrepairable too. If I could find a cheap space saver then I might go for that but was just wondering about the repair kit age.