I used to buy those bike-store tire patch kits. Most of them had round black patches with orange edges. But they seemed to peel away or "ballon" around the hole sometimes. They didn't always last.
So far, the best patches I have used come from an auto parts store. Brand name: "Monkey Grip." The patches are square, but the glue is the same. The bottom line: you get more glue (not that you need it!), more patch material, and the patches seem to last better. OH! They're only 99 cents! (Bike store patch kits are about 3 dollars.)
Am I missing something? :confused: