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#1
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Slow leak--arrrrrgh!
So my front tire went flat again, due to a slow leak
I had thought that I'd fixed the puncture in question, but, no, a corner of the patch hadn't stuck onto the tube properly, so was causing a slow leak. I'm just annoyed as all hell, because now since it's *badly* patched, the leak is irreparable--the bits of the patch that I stuck on CORRECTLY went on when they were supposed to, and can't be torn free from the tube for love or money. Ugh. You live, you learn. -Luigi |
#2
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Slow leak--arrrrrgh!
On Wed, 21 Jul 2004 23:17:03 -0400, Luigi de Guzman
wrote: So my front tire went flat again, due to a slow leak I had thought that I'd fixed the puncture in question, but, no, a corner of the patch hadn't stuck onto the tube properly, so was causing a slow leak. I'm just annoyed as all hell, because now since it's *badly* patched, the leak is irreparable--the bits of the patch that I stuck on CORRECTLY went on when they were supposed to, and can't be torn free from the tube for love or money. Ugh. You live, you learn. -Luigi Hi, I see these posts often and I don't understand why some people have problems. I patched a tube today and in its place installed another patched tube. I know it has been described before, by those with more experience than I, but Here is how I do it. I sand an area much larger than the size of the patch. The same with the glue, I always cover a larger area. Today, because I was home and could wash up, I used my finger to spread the glue evenly. I wait until the glue is dry and apply the patch. I try to use a flat surface, where I can press the patch down evenly, with decent pressure. I press and hold it tight for probably 30-60 seconds. Done! I have been using the Park Tool patches because that is what my LBS carries, although today I used the kit that came with my NashbarBig Tool Kit 2. Why do you think your patch didn't hold? Life is Good! Jeff |
#3
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Slow leak--arrrrrgh!
On Wed, 21 Jul 2004 23:19:23 -0500, Jeff Starr
wrote: Why do you think your patch didn't hold? Didn't sand a large enough area of the tube. That's easily seen. Yes, I know. I'm an idiot. -Luigi |
#4
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Slow leak--arrrrrgh!
Why do you think your patch didn't hold?
Didn't sand a large enough area of the tube. That's easily seen. Yes, I know. I'm an idiot. -Luigi A friend of mine told me that the reason you sand the tube is to remove a powdery chemical residue from the tube. He claims that when tubes are made, the chemical is put in the mold to allow the tubes to be removed easily. The problem is that the glue for patches will not work on the residue. The residue has to be removed first and that is done by sanding. I understand that you can also remove it by using a little acetone. I have tried it and it seem to work great. Of course, I still sand the tube just in case. Nothing like having a backup. |
#5
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Slow leak--arrrrrgh!
A friend of mine told me that the reason you sand the tube is to remove a powdery chemical residue from the tube. talc... talcum powder... baby powder. so the tube doesnt stick to itself in storage. |
#6
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Slow leak--arrrrrgh!
Pbwalther wrote:
Why do you think your patch didn't hold? Didn't sand a large enough area of the tube. That's easily seen. Yes, I know. I'm an idiot. -Luigi A friend of mine told me that the reason you sand the tube is to remove a powdery chemical residue from the tube. He claims that when tubes are made, the chemical is put in the mold to allow the tubes to be removed easily. The problem is that the glue for patches will not work on the residue. The residue has to be removed first and that is done by sanding. I understand that you can also remove it by using a little acetone. I have tried it and it seem to work great. Of course, I still sand the tube just in case. Nothing like having a backup. your explanation works for me. I useta work in the fibreglass industry. We would treat moulds with a very thin spray of stuff that let the product pop away from the mould when encouraged by a shot of compressed air. Makes sense to me. The rubber doesn't need to be roughened. It needs to be chemically clean, so the glue can bond with the rubber with no interference from the relaeasing compound, whatever it is. Bernie |
#7
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Slow leak--arrrrrgh!
"Jeff Starr" wrote in message
... I patched a tube today and in its place installed another patched tube. ...I sand an area much larger than the size of the patch. The same with the glue, I always cover a larger area. Added tip: with a pen, mark around the hole at some distance from it, like this, where "*" is the hole: | - * - | (looks best in fixed font) This way, after you sand and glue a generous area like Jeff suggests, you can still get an accurate visual read on where the hole is and you can be sure to put the middle of the patch right over the hole. |
#8
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Slow leak--arrrrrgh!
Luigi de Guzman Wrote: So my front tire went flat again, due to a slow leak I had thought that I'd fixed the puncture in question, but, no, a corner of the patch hadn't stuck onto the tube properly, so was causing a slow leak. I'm just annoyed as all hell, because now since it's *badly* patched, the leak is irreparable--the bits of the patch that I stuck on CORRECTLY went on when they were supposed to, and can't be torn free from the tube for love or money. Ugh. You live, you learn. -Luigi Carry a spare tube. It is cheap insurance. If you mess up patching one you still have a spare. I've had problems of developing slow leaks in the tubes on my old Trek road bike (aluminum rims and presta valves). The leak starts where the valve stem passes through the rim. I've de-burred the rim holes. The only fix I've been able to come up with is cutting a hole in a patch and placing the patch over the valve stem before I put the stem through the hole in the rim. I leave the outside lock nut on the valve stem loose. So far no more problems. The rims on my 'bent are slightly different (still aluminum rims and presta valves), the valve stem hole is nicely machined and the valve stem fits like a glove. I've also had the presta valves leak a little even when the valve mechanism locking nut is tightened down (so far not on the 'bent though). 'bent Brian -- bentbrian |
#9
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Slow leak--arrrrrgh!
On Thu, 22 Jul 2004 14:32:12 +1000, bentbrian
wrote: Carry a spare tube. It is cheap insurance. If you mess up patching one you still have a spare. Or, the much ballyhooed, and really quite good, strategy of using the spare tube for the first flat on the road, carrying the patch kit only for a second flat in a single ride; then, patch the tubes in bulk. -- Rick Onanian |
#10
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Slow leak--arrrrrgh!
Wed, 21 Jul 2004 23:17:03 -0400,
, Luigi de Guzman wrote: I'm just annoyed as all hell, because now since it's *badly* patched, the leak is irreparable--the bits of the patch that I stuck on CORRECTLY went on when they were supposed to, and can't be torn free from the tube for love or money. Ugh. You live, you learn. In a recent protracted thread about patches, Jobst Brandt divulged that patches can be removed with heat. I tried it on trashed tube and it works a treat. So, for love, your mom will let you use her iron. For money you can buy your own at the thrift store. A fairly hot setting will soften the glue sufficiently to remove the patch easily. -- zk |
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