I get by with this for about 2-3 months, about the same as Stan, this sealer claims to foam and keeps it from drying out in one big chunk. After 3-4 months I need to add some sealer and it will seal again. A year later, when the tire blew out, I notice that there is still sealant in it, but it hasn't dried into a huge lump like other sealants. I use lilac to apply this through the valve stem, not the best way but I'm lazy and after a year or so the stem starts to stick together. So I replaced them with tires. You may not want to do this.
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