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Patches becoming less elastic with age?

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Patches becoming less elastic with age?

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Old 07-09-18, 08:10 AM
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seanspotatobiz
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Patches becoming less elastic with age?

I bought some puncture repair patches a few years ago and I'm pretty sure that they were fine the year that I got them but now every time I use them they crack when the tyre is inflated. Is that a common thing when patches age or are they just poor quality patches? It might make sense to buy them in smaller quantities next time.
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Old 07-09-18, 08:29 AM
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I'm still patching from a box of 100 Rema patches I bought more than 15 years ago, and they're still working fine. What brand, or where did you buy them?
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Old 07-11-18, 06:07 AM
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Originally Posted by pdlamb View Post
I'm still patching from a box of 100 Rema patches I bought more than 15 years ago, and they're still working fine. What brand, or where did you buy them?
I got them on eBay in a sheet of 48 with no manufacturer identified. I was able to improvise a patch by cutting a piece from a roughed up bit of innertube and it seems to be holding for now.
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Old 07-11-18, 06:41 AM
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This may turn out to be a dopey question (ain't the first time !), but how can you tell "they crack when the tyre is inflated" ? Aren't they hidden by the tire itself?
BTW, my problem is not having enough patches, it's having enough glue !! I generally get a single tube repair out of a patch kit, because the glue has solidified by the time I go to use it again, so I have a small stash of patches, that have no glue !!
It would be handiy if someone sold tiny 3-packs of glue, and even better, if the companies making patch kits would include multiple small tubes of glue, rather than the one tube that's way more glue that is needed for a single job, and that often doesn't survive until it's needed next.

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Old 07-11-18, 08:43 AM
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pdlamb
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Originally Posted by Brocephus View Post
BTW, my problem is not having enough patches, it's having enough glue !! I generally get a single tube repair out of a patch kit, because the glue has solidified by the time I go to use it again, so I have a small stash of patches, that have no glue !!
I've got 4-5 tubes in the back room with leaks just waiting for a round tuit to show up before I patch them. I'll likely get all of them with a single patch kit. At the risk of jinxing myself, it's been a while since one or two spare tubes didn't get me home and I had to patch on the road!
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Old 07-11-18, 08:58 AM
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Originally Posted by Brocephus View Post
This may turn out to be a dopey question (ain't the first time !), but how can you tell "they crack when the tyre is inflated" ? Aren't they hidden by the tire itself?
BTW, my problem is not having enough patches, it's having enough glue !! I generally get a single tube repair out of a patch kit, because the glue has solidified by the time I go to use it again, so I have a small stash of patches, that have no glue !!
It would be handiy if someone sold tiny 3-packs of glue, and even better, if the companies making patch kits would include multiple small tubes of glue, rather than the one tube that's way more glue that is needed for a single job, and that often doesn't survive until it's needed next.
Of course when the patch fractures it is obscured by the tyre itself but when I subsequently remove the tyre to investigate why it's leaking I can plainly see the fracture in the patch I applied only 20 minutes before. This happened a few times before I was ready to give up on that bunch of patches (it's annoying because there are many left).

I can help you regarding the vulcanising solution though; it's not actually glue and it doesn't go solid in the tube; it's mostly a solvent and it evaporates through tiny gaps in an imperfectly-sealed tube, leaving you with a tube full of air. The solution is to wrap the tube up (after tightly closing it) in a small plastic bag to keep any fumes in high concentration around the tube, increasing the vapour pressure and reducing further evaporation. Once I started doing that, my tubes stopped emptying on their own and I get a lot of use from a single tube.
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Old 07-11-18, 09:11 AM
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I've never had a patch crack, so I'd tend to believe that you got the patches that failed Q/C. I replace patch kits every year or two. Even without evaporation, I doubt there's enough glue to apply all of the patches that come in a kit.
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Old 07-11-18, 10:02 AM
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Originally Posted by BlazingPedals View Post
I've never had a patch crack, so I'd tend to believe that you got the patches that failed Q/C. I replace patch kits every year or two. Even without evaporation, I doubt there's enough glue to apply all of the patches that come in a kit.
Maybe I'm stingy with the vulcanising solution but I experience the opposite; not enough patches for the amount of solution.
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Old 07-11-18, 10:46 AM
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Originally Posted by Brocephus View Post
This may turn out to be a dopey question (ain't the first time !), but how can you tell "they crack when the tyre is inflated" ? Aren't they hidden by the tire itself?
BTW, my problem is not having enough patches, it's having enough glue !! I generally get a single tube repair out of a patch kit, because the glue has solidified by the time I go to use it again, so I have a small stash of patches, that have no glue !!
It would be handiy if someone sold tiny 3-packs of glue, and even better, if the companies making patch kits would include multiple small tubes of glue, rather than the one tube that's way more glue that is needed for a single job, and that often doesn't survive until it's needed next.
You can get multiple small tubes of glue from ebay.

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Old 07-11-18, 10:53 AM
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Originally Posted by Brocephus View Post
This may turn out to be a dopey question (ain't the first time !), but how can you tell "they crack when the tyre is inflated" ? Aren't they hidden by the tire itself?
BTW, my problem is not having enough patches, it's having enough glue !! I generally get a single tube repair out of a patch kit, because the glue has solidified by the time I go to use it again, so I have a small stash of patches, that have no glue !!
It would be handiy if someone sold tiny 3-packs of glue, and even better, if the companies making patch kits would include multiple small tubes of glue, rather than the one tube that's way more glue that is needed for a single job, and that often doesn't survive until it's needed next.
Do you make sure to squeeze the tube until glue just starts coming out when you recap it? I always do to ensure there is no air in the tube. I have pretty good luck with with the glue in previously opened tubes.\

Ben
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Old 07-11-18, 12:38 PM
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Self adhesive patches are made to get you home, a proper patch , tube surface well prepared and patch applied
is good for years..
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