I was touring with friends this weekend and one friend was on his last patched tube when the patch failed. We had plenty glue patches, but could not get them to take. We suspect the humidity was effecting them. One of the crew finally tried a trick from his childhood and touched a lighter flame to the glue for a second or two. After an hour of failed attempts to repatch the tube using the instructions in the kit, this method worked. Our companion was able to make it home on that patched tube, 45+ miles.