Several years ago when I installed the Duro Power Grip on my Muley I also put about 8 oz of Slime in the tube. The other day as I was getting ready for a 170+ mile ride I was doing a "pre-ride." Before I started I was looking at the Duro and what do you think I saw but a nail head. On my last ride of about 160 miles I must have picked up this nail. It went right through the middle of a big center lug. (I cannot imagine the force let alone the odds of this nail going all the way in) So what to do? As I pulled the nail out it just kept coming... 3" total and then the hiss of air. I then rolled the tire so the hole was down and bingo the Slime stopped it. Well what to do now? I don't have an extra tube and I didn't have the time to patch the hole. So I just added another 8 oz of slime and went for a 1 1/2 hour ride. It only lost 1 lb of air pressure. I set it in the garage with the hole pointed down and expected to see it flat in the AM. It wasn't... just another lb. lost. OK... I then took it for a 9 hour 170+ mile ride on some tough fire roads from Yucca Valley to Big Bear and around Big Bear. Checking the pressure at almost every stop. The whole day I only lost 1 lb. of air. THE SLIME WORKED!!! I've ordered another tube and will install it but FWIW, I'm REALLY convinced of the power of the Slime. Here a few pictures of the nail.