If you really can't get the patch to work and are willing to pay 10 or 15 bucks, you could take it to the auto mechanic. They have a heavy-duty patch setup that works on car tires, so it must work on bike tires. Note that I'm not talking about the plug they appy from the outside; I'm talking about a patch similar to a bike tire patch that they apply from the inside after taking the tire off the rim. Some shops use the plug, some use the patch, so you might have to call a couple of places to find one who does the patch. But that should fix 'er right up.