When steel belted tubeless tires came along, the only effective repair method was a patch for the inner liner, and a plug that sealed the belt from contamination by water, mud, salt etc. I started installing "patch plugs" with a rubber stud built into the center of the patch in the late 1970's, and that's the only kind of tire repair I'm willing to bet my life on, regardless of the cost. I don't intend to be a dead cheapskate!
Jerry
