I put one of these on my spare, on the sidewall, on almost the exact same spot even, still hoping pressure fine two months later. I used a die grinder to rough up the inside with a roloc disk, applied rubber cement, patch/plug, rubber cement, and repair sealer. Excessive? Probably, but we already know the tire is junk. If it's being carried anyway, might as well give it your best shot. You'll still need to limp it like you're driving on a flat, it's just asking to pop. You couldn't pay me to do it to a daily driver or a customer car though, for those cars, I get the tire warranty.