Maybe you have the same problem I just did. I forgot not to use Worthless (some call them Glueless) patches. Some call them preglued which must be short for "too damn weak material inadequately preglued with ineffective glue".Mister C said:Lastly, i have given up patching tires. I just replace the whole tube. It seems more reliable to me but does have added cost.
I buy the blue-backed rubber patches which come with a metal scraper and a tube of cement. Grocery stores carry them in the hardware/automotive department. You abrade the tube around the hole, spread a thin layer of glue on both surfaces, let dry while still separate, then press together. 5 min seems like enough. A repair like that will last forever.