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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. Commented Jun 6, 2020 at 20:42
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    " 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
    Commented Jun 6, 2020 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
    Commented Jun 6, 2020 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
    Commented Jun 6, 2020 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
    Commented Jun 7, 2020 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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  • It may depend on the brand but I have a very fast drying out of used glue tubes and when I mention it others have the same experience. Better replace the tube after using it.
    – Willeke
    Commented May 8, 2023 at 4:16
  • @Willeke That would be too wasteful for traditional vulcanization solutions. I do not have an experience of them drying out. Check them from time to time. Commented May 8, 2023 at 5:34
  • The last 4 tubes I used dried out within months, possible weeks. I now save up tubes with leaks and repair them when I have a few. I hope some glue maker will start with smaller tubes, for one or two repairs.
    – Willeke
    Commented May 8, 2023 at 7:07
  • @Willeke OK, so I went to check the glue in the cheap Decathlon set that I have at home and it was indeed dry. Then I went to the shed and checked the glue in the mountainbike set (Ferdus). It certainly have not been used in the last two years. It ran OK. Sadly I lost quite a bit of it when it started to run from the tube. I guess it also depends on the quality of the glue tube and possibly also the vulcanization fluid tself. Commented May 8, 2023 at 8:58
  • They sell these fluids even in MUCh bigger packaging (even 0.8 l ferdus.cz/en/1-1-631/ferdus-products/repair-fluids/…). They are not meant to be single use. Commented May 8, 2023 at 9:00

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