[QUOTE=Da Tinker]When I switched to 25 mm tires at 95 psi, the park patches would hold only about 20 - 30 miles on a hot day. QUOTE]

That's odd! I lived in Bakersfield California where the summer temps got over 100, I use nothing but 700x26 for the 8 years I lived there, and used the Park patches, and it's on those tires that I still have a 4 year old tube with a Park glueless patch that rode in that heat for 4 years! Plus a second one was applied 1 year ago to the same tube and no problems. I use Specialize Ultralight 65 gram tubes, these tubes are sized smaller for 19-23 tires if that means anything, but I doubt it. I run 100psi in the rear and 90 on the front. I rode all the time in that heat range from short 12 mile rides to longer 100 milers and into mountains; I also did 2 158 mile rides going from the desert heat west into the mountains and down to the coast on that same tube. I since moved to Indiana this last January so I no longer ride in this sort of heat.