While running the VX at an ERS rallysprint a few years ago I got a sidewall puncture in a brand new Yokohama Geolandar MT+ and was able to repair with Slime. I basically dismounted the wheel and tire then after filling with Slime and air just laid the tire with the side down that had the sidewall puncture. It's been great ever since, but all they were used for is rallycross and a little off-roading.



The proper way to fix a sidewall puncture is to remove the tire and apply a vulcanizing patch to the inside of the tire after prepping the area by proper cleaning and scuffing, preferably with a power scuffer. It's still not considered "safe" by the DOT, but for the most part is quite functional.