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I have a tyre repair kit that I bought ~4 years ago. I never used it. In fact, I never used such a kit in my life.

Does the glue expire after some time, or is it good indefinitely? The tube is still sealed, but I am worried that should I need to use it, I might find that the glue has already set.

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    Basically it's good for 10 years or so unopened. Once you open it maybe 2 or 3 years. But note that the goo on the patches also dries out, probably in 5 years or so. – Daniel R Hicks Jun 6 '20 at 20:42
  • " In fact, I never used such a kit in my life." You can be quite sure that whatever deity and/or statistical property of our universe will cause you a puncture in the next 5 rides. Get ready :) ! On a slightly more serious note, I would worry about the levers becoming brittle and breaking in your hands. I have the same levers ... well, I have one left, I think I changed 4/5 tires at maximum. I suggest replacing them with some levers from the same brand, but the wider ones (the colorful ones). – EarlGrey Jun 6 '20 at 21:42
  • @EarlGrey I did have a few punctures (too many blackberries here), but most of the time it took until the next morning for the tire to deflate. The one time it didn't, I didn't have the repair kit :-( – Foor Jun 6 '20 at 21:59
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    I'd suggest carrying spare tube on rides, and fix the puncture in the warmth and comfort of home. No need to carry this kit on a ride. – Criggie♦ Jun 6 '20 at 23:27
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    @Criggie and when you are without the kit, then you have a puncture in the new tube because when you quickly changed the tube you forgot about checking the tires for debris/thorns/nails ... I am a pragmatic optimist: either I bring both a spare tube and a kit, or none. – EarlGrey Jun 7 '20 at 9:07
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Not indefinitely, but it is good for many years. After you open it, there could be a tendency for drying, but even that takes a very long time. Even opened and well closed glue will survive for years.

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