I had a puncture on an A/T truck tire in Indianapolis and the tire dealer said he was too close to my shoulder to fix it because the patch was coming off could solve. My friend told me to take the tire to his shop and he used this system to do it. I was very impressed. That was 2 years ago and the tires hold air like new. Fast forward to this week: I just tightened a bolt in my everyday hatchback. I used Prime, got the kit and popped the tire in under 15 minutes without removing the wheel! I expect the cork to last as long as the tire, like on my truck. Yes it is possible for the plug to come out but in my experience and many others this is very unlikely as the design of the mushroom plug is great and the silicone like material will expand around the puncture and remain flexible for life. It's a great system. Unrolling the steel casings of the belts inside the tire with a tool is the only tricky part; That requires strong hands. It's only worth it for saving time on an apartment without having to take the wheel off and fit a spare wheel. BE SURE! Use jack stands when lifting the car. Couldn't be happier with it. Also, as others have pointed out, the PACKING PLIERS included with receipt will help with removing the road hardware. Fantastic product.