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R15757 snipe further from cover of anonymity:
I can let the glue dry over night and it is still a tacky sheen in the morning. Oh man, this is getting comical. In a previous post some months ago--when we happened to be discussing this exact issue although you seem to have forgotten--I mentioned that the glue should dry until your so-called tacky sheen is all gone. I guess you have a different definition of tackiness. A clean glossy surface of dried patch glue remains tacky until it oxidizes and becomes useless as an adhesive surface for a tire patch. If that were not so, patches would not adhere at all. Or, conversely, there would be no need for patch glue. "Tackiness" I equated with stickiness. I said the glue should dry until all hints of stickiness have left it, which is easily tested by pressing a finger or fingernail onto the glued area and pulling it off. I think you are redefining tackiness. Smooth surfaces, such as glass, or a clean fingernail, stick to completely dry Seran Wrap (PVDC) that has for its useful life a tacky surface. This is the goal of applying patch glue to a sand papered inner tube. The red gummy surface of the Rema patch is designed to bond to that surface and combine with it to a point that it cannot be practically removed... except by heating. That is a chemical process that takes time. And you made your ignorance unambiguous when you replied, and please permit me a paraphrase as I do not wish to look up the exact quote, that if the glue had dried that much then a patch would not stick to it "any more than it would stick to a dry window pane." Can you say this without impugning my intelligence or are you trying to be rude? As I said, if it did not display tackiness, a characteristic of smoothness, it would not work as a primer on surfaces to attract a patch. It all depends on what you visualize under your definition of "dry enough" and what works. It was then that it hit me: Jobst Brandt has never actually patched a tube correctly, so he doesn't know what it's like. Fascinating! What do you believe is incorrect about tubes that I have patched, considering that you have never seen patches that I have applied to tubes. What makes you so adamant in denouncing my ability and understanding of applying patches? I get the impression that I somehow caused you injury or embarrassment and that you are trying to get even. As I said, have you tried pulling a patch off immediately after application? Yes a few times when I was attempting to patch two nearby punctures with a single patch, and missed. Then I tried to pull the patch off and reposition... If so, you will notice that the patch can be pulled off easily even by pulling the cellophane from one corner. Eh?? Now you're freakin me out. No--the correctly installed patch is extremely difficult to remove from the first second after installation. If you proceed as directed, the patch locks on to the tube immediately and it ain't comin' off. You better get it right the first time. If you ever get around to trying it, you'll have one of those eureka! moments. I see you avoid explaining why Rema patches are made so that the cellophane can be peeled from inside to outside after applying the patch, something that Rema designed so the patch will not peel off while pulling off the cellophane. If you don't believe that, how about sticking a patch on half way while holding onto the raised portion and note how easily it pulls off without separating the red part from the black, something that is not the case with a cured patch. Maybe you can explain in non-Rube Goldberg terms how dry the glue must be ... The glue must be dry enough that it loses any hint of stickiness, easily determined by touch. Dry. Rema directs a five-minute wait, I have found that 3 minutes is usually enough. OK, So ten minutes is enough but how long is the minimum? We are not out on the road to sit around gratuitously waiting more than enough to apply a patch. I proposed a realistic measure that sees when all the volatile parts of the glue have evaporated. What do you believe occurs beyond the point where the glue thickness is essentially zero and only a tacky sheen that replicates the surface of the tube remains? Just repeating that this is all wrong and that your patches are perfect does not resolve anything. ...and what the mechanism is that causes patches to separation from the center outward. Hmmm lesseee... If you don't let the glue dry before applying the patch, the patch don't stick? I think you have not tested what I explain... Bull****! I cut through all the patches in a perfectly good tube and you'd better recognize. None of the patches showed any sign of pulling away. (As I already pointed out in a previous post.) Leave the feces out of this. I also explained that I have examined many patched tubes with partially delaminated patches and explained that these have two causes. The first is from not removing mold release (the natural surface of the tube) with sand paper and the second that the patched tube is immediately put into service. Of course glue that is not dry is the third cause but that was already covered in the instruction on waiting before applying the patch. I have seen the results of properly patched tubes that later had bulged patches from immediate use after patching. Although the patch was flat on the tube before inflation, on removal afterwards it was bulged and had its center delaminated although without leaking then or later. Subsequent autopsies revealed this condition. Hold it! Let me know what it should say, and be specific. Well you could just say, "simply follow the directions in the patch kit, they work great." I mean, if someone is patching a tube, they probably have the directions folded up right there. That won't work because drying time is not a constant and the instructions do not mention patch curing time in place, something that you insist does not occur although I can demonstrate it (as you can). Or you could simply direct people to: allow several minutes for the glue to dry (until a fingertip pressed lightly onto the glued area can be pulled away without any hint of stickiness) before firmly pressing the patch on. While there is a minimum drying time for glue to be effective, there is no maximum if the glued area can be kept reasonably clean. The glued area must exceed the area of the patch so that all the patch's edges are in contact with dry glue. Here's the best part: Once the patch has been firmly pressed over the puncture, the tube can be stuffed back into the tire and ridden immediately without worry, provided the rider has thoroughly checked the inside of the tire for any protuberances. Well as I said that works and it must be done at times but you should not be surprised if it develops a slow leak later and I explain how this can occur. That the patch should land on a fully prepared area goes without saying, but the hazard of riding a fresh patch remains, especially for a tube that is substantially smaller than the tire cross section, a common practice these days of weight saving. In fact some of the tubes I find along the road are abut as large in cross section as the tip of my little finger. This size is smaller than a common Rema patch when the tube is laid flat for patching. If you say that, then you can just cut out all that other irrelevant gobbledygook. You may call it that but I believe the dynamics of a tire and tube should be understood for an appreciation of what a patch or boot must endure. I suppose you haven't tried the business card test of tire casing distortion or you would be aware of the distortion a tire an tube experiences with every rotation. I hope you are aware that in cold weather and high humidity, glue curing takes longer. Jobst, "curing" is an irrelevant concept here and you need to get over it. Just spread the glue on, LET IT DRY, press the patch on, and ride. That's it, you're done. OK, so you like to use the term "dry". Well drying takes longer in cold weather and high humidity. Are you aware of that? Extreme cold can make patching impossible because the glue crumbles off the tube. High humidity might mean a few extra minutes of drying time. Oh. That's a new concept. I think you'll find that patching glue does not freeze and does not get brittle with cold temperature. It just loses volatility and takes longer to dry. Try it, you'll like it. I only brought that up to underscore that drying time is a variable for which a different control than a stop watch can be found and that measure is the appearance of the glue surface and how it looks when ready to use. I take it that this is what you are arguing about, nothing else. Jobst Brandt |
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"Zoot Katz" wrote in message ... Thu, 29 Apr 2004 04:37:21 GMT, , wrote: OK, So ten minutes is enough but how long is the minimum? I use very little glue and I'm off in under 3 minutes. Greg |
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"Zoot Katz" wrote in message ... Thu, 29 Apr 2004 04:37:21 GMT, , wrote: OK, So ten minutes is enough but how long is the minimum? I use very little glue and I'm off in under 3 minutes. Greg |
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G.T. wrote:
"Zoot Katz" wrote in message ... Thu, 29 Apr 2004 04:37:21 GMT, , wrote: OK, So ten minutes is enough but how long is the minimum? I use very little glue and I'm off in under 3 minutes. Greg You're not meant to sniff it. |
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G.T. wrote:
"Zoot Katz" wrote in message ... Thu, 29 Apr 2004 04:37:21 GMT, , wrote: OK, So ten minutes is enough but how long is the minimum? I use very little glue and I'm off in under 3 minutes. Greg You're not meant to sniff it. |
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On Thu, 29 Apr 2004 17:09:13 +0100, Vincent Wilcox
wrote: G.T. wrote: I use very little glue and I'm off in under 3 minutes. You're not meant to sniff it. Personally, I think that's the whole problem with this thread...both people have patched so many times that the little bit of inadvertent glue sniffing each time has cumulatively destroyed the portion of their brain that gets the most bloodflow when patching (presumably, the portion that controls patching -- the medulla patchtubetto or something, right?). -- Rick Onanian |
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On Thu, 29 Apr 2004 17:09:13 +0100, Vincent Wilcox
wrote: G.T. wrote: I use very little glue and I'm off in under 3 minutes. You're not meant to sniff it. Personally, I think that's the whole problem with this thread...both people have patched so many times that the little bit of inadvertent glue sniffing each time has cumulatively destroyed the portion of their brain that gets the most bloodflow when patching (presumably, the portion that controls patching -- the medulla patchtubetto or something, right?). -- Rick Onanian |
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