One thing that I always keep in mind, w/r/t sealant, is your mileage and expected rate of miles/puncture. I've pretty much stopped using OS Endurance because a) the regular stuff seals better for me and b) the sealant doesn't stay in my tires long enough to warrant Endurance. During prime riding season. I've found my tires bone dry less than 4 weeks after dosing them, presumably being expended on punctures that I didn't notice.