So I was 25 miles up a gravel road last week doing some exploring of water I plan to fish once runoff subsides when I got a flat in my Jeep. I stopped right away and so didn't damage the side walls. I had a can of tire fix-it, followed the directions and emptied the can into my tire. It barely lifted it two inches. Certainly not enough to drive on. Fortunately, I had a spare, though the jack sank into the gravel/mud as it lifted the vehicle. I had enough room to remove the flat but not to mount the spare. So, I ended up digging an 3-4" hole in the road so I could align the tire and get it on. Took my tire to a gas station and mentioned I had emptied a can of tire fix-it and it had hardly inflated the tire. The guy at the station said that was a common problem especially with larger SUV and truck tires. I guess I need to carry two or three cans of the stuff. I'm curious as to what others experience has been with these products.