I had a slow leak somewhere in the tire. I've tested it several times at a tire shop, cleaning and sealing the bead area and replacing the valve stem, but it never worked. So I tried that. After installing it, I parked for a day and the pressure was still relieving. I then had the opportunity to take a pleasant one-hour city and highway drive. Then I turned it off and it has lasted the last week. This product seems to work but you have to drive to rotate it inside. The balance seems about the same as before. Pay attention to the variant with two large vehicles. It comes with two 4-ounce bags of sealant, but only comes with a top bolt and valve stem remover. I got this for my car as two packs are better value than one pack ($27 vs $20) and I only used one pack. Now I have a reserve for the future.