to save a lot of work .. i tried this and it works .. Preston yes Preston .if the tire has a slow leak put in 1/2 cup that slimy sh@$ will seal it up .. my sons atv tires were so bad every day we had to pump up 1- 2 -3 tires every time we put Preston in 2 years later still never had to pump up a tire .... good luck guys .. and you know i have never seen a lawnmower tire wore out yet . weather cranks yes . and the flat tire in a can . if you just need to finish the yard ya thats the stuff . save your money