Originally Posted by
RubeRad
Maybe this is a dumb question, but when you put glue on the tube, presumably you want to use a little too much, to ensure that all of the patch is sitting on glue. This means there will be a little glue on the tube around the edges of the patch. What is the risk of that circumferential glue causing the tube to bond with the inside of the tire, so that you can never get the tube out again (without ripping it)?
I've never had this happen, but I don't understand why not. Do they make the inside of tires so they are not chemically compatible with patch-glue?
It's possible. It doesn't happen too much, because the tire isnt' usually prepared for patching, and so it's not likely to stick. Also, remember that the patch is part of the system: it's got ZDDP or similar in it, which is a vulcanizing ultra-accelerator. the vulcanizing accelerator in the cement is there mostly to kick it off, and allow the reaction to work at room temperature.
If you're worried about it, it's pretty easy to rub off the excess glue once you've put the patch on.
Patches sticking to the tire carcass is a real problem in truck and auto tube type tires, where there is much more heat available to vulcanize the tube to the tire: a plain tube with no glue can get vulcanized to the tire. The usual solution is talc or chalk, which keeps the tube from sticking to the tire.