Interesting. I've used the Park GP-2 (glue-less) patch kit with zero adverse effects. My goal is to always make sure that I never put the patch over a seam in the tube; it leaks that way. Once I apply it to the tube, I massage it for a minute or so to make sure it sticks really well. I think I had a tube with 3 or 4 of these patches on it at one point.