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Help request---patching tubes(7 posts)

Help request---patching tubes_BLT_
Jul 20, 2001 8:57 AM
Had the unpleasant experience yesterday of two flat tubes followed by 3 unsuccessful attempts at patching tubes followed by calling to beg for a ride home. Any advice on making patches stick? I wiped the tube clean, scuffed it with the sandpaper, and stuck the patch on firmly but it wouldn't hold much pressure. Each one leaked out before I got near an estimated 90psi. Any little techniques to make them stick better? I always replace tubes when I have a flat, and I have rarely had to resort to a patch, resulting in my apparent inablity to patch tubes. Any advice is appreciated
re: Help request---patching tubesDINOSAUR
Jul 20, 2001 9:15 AM
I pack two extra tubes and repair the punctured tube later when I get home and carry it as a spare. This is a common problem when trying to patch a tube on the road. I think it has something to do with temperature. Some guys don't mess with patching, they just chuck the tube and replace. If could buy tubes by the case at a killer price, I'd do it myself. I had the same sort of problem once, but I snapped two valve stems and had to call my wife to come rescue me with a new tube and a floor pump. It might be the brand of patches. My LBS sells their own patch kit, I don't know what brand, but they work better than anything I've found. Next time I'm in the shop, I'll ask. As an afterthought, it might be the glue and not the patches (?)...
re: Help request---patching tubesLone Gunman
Jul 20, 2001 9:16 AM
I have a good idea, leave the patch kit at home and carry 2 tubes that are NOT patched. Why fool with a patch kit when you can't actually 100%(water dunk test) know that you got the hole patched? My last 2 flats have been from leaking valves. I have had enough patchkit failures at a later date to know that new tube or no tube. I used to put the patched tubes on the roller trainer and they failed also.
did THAT once,Rusty McNasty
Jul 20, 2001 9:27 AM
ran over some glass, got 2 flats. put in 2 tubes. pinched one tube while mounting (i was on my way to morning lectures). of course, since i was carrying 2 tubes, i figured that i didn't need to carry a patch kit!! big mistake!
re: Help request---patching tubesJofa
Jul 20, 2001 9:44 AM
It sounds like you were using the newer 'glueless' patches. This are universally terrible, as the glue on them doesn't vulcanise with the rubber of the tube. Use the old style patches with glue- not the ones cut as squares, but the round ones that come on metal foil, which have the feathered edges.

The sandpaper is used not to roughen the tube, but to clean the tube of mold- release (the whitish slidey stuff, leftover from manufacture). Hence you don't have to go crazy with it, just clean off the top layer.

Apply the glue with your finger, and LEAVE IT. About 10 minutes, until it's totally dry, not at all tacky. Go and sit on a wall and look at the view. You're not racing anybody, after all.

Stretch the tube over the back of your hand. Press the patch hard into place, and crack and peel the plastic film from the centre of the patch. This will prevent it from lifting.

Put everything back together. Don't worry about talc, it doesn't do anything except get mucky.

I've repaired probably hundreds of tubes like this over the years, and I can't remember the last time a repair failed; it's happened, sure, but not in years. It's perfectly do-able on the road if you're not holding anybody up, and it helps save on landfill.
I agree - self-stick patches are doomed to fail!MikeC
Jul 20, 2001 9:54 AM
I have never met anyone who's successfully used a glueless patch on a high-pressure road bike tire. The old way is the only way.
Jul 21, 2001 3:09 AM
After my experience I do plan to carry 2 spare tubes instead of one. I will also go out and try the old glue-on patches. Next time I'll be ready...