So how reliable are those vulcanization patches? Over the last year I've been riding with slime tubes in my 700x28 tires and have had no need to replace a tube or apply a patch. Generally the trails I ride only have thorns to contend with and the slime does a good job of sealing those holes. Today I got a glass cut that required a patch and it worked great. I continued on for about another 24 miles on the patch with no incident. So should I replace the tube or is it safe to continue riding on a patched tube?