I've used slime in my atv tires since 2005 and have had great luck as in no flats. Have also used it in the lawn tractor tires and no flats. I've also used the grey stuff from the co-op they pump out of a drum and it has also worked. On one atv I did have to plug a big hole with three plugs that finally sealed up and its holding air 3 years later. All of my experience has been with tubeless tires.