I've had problems with the glueless patches because I use high pressure tires (120psi) and chances are I didn't clean the tube well enough. If you have to clean the tube really well for it to work, it seems like a bad design for something meant as a quick roadside fix. To me, it's not worth the effort to use the stick-on patches - I just carry an extra tube and patch the leaks with a traditional patch kit at home.