For some time I have been searching for a tire sealant that didn't sling and lasted. Just tried Tuf Shine. Labeled as a permanent sealant that adds UV protection and lasts the life of the tire. Comes with a tire cleaner, a brush, nitrile gloves, applicator and the sealant. Looks good. Have driven several hundred miles since and no sling. Pretty costly but it looks like the amount will do 4-5 sets of tires. If it does lasts the life of the tires, normally for me 3-4 years, it begins to make sense. Will update if anyone is interested. Listed on autogeek.net.