My tire tube repairs never work. What am I doing wrong?
Number 1_ Glueless parches .. I never use them, not being a waster of time and Money.
They are only temporary at best .. so your expectations of glue-less patches may be examined.
Bring a spare tube . then use the proper surface prep and an old fashioned patch Kit
on the punctured Tube and then It will be your spare the Next time.
and Make Sure you have not left the debris that made the 1st puncture in the tire.
My LBS has Park's patch Kits, I've used Rema For decades ..