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I always thought it sealed through oxydization too but I found out that stans is actually a collection of latex crystals suspended in liquid latex.
When you get a puncture the liquid is drawn towards the hole and the crystals plug it. Apparently the race formula has larger crystals for more "high pressure" applications so as the hole is plugged quicker.
No idea on pit stop though.
BlackMath
@Jonny69
Anyone know if Stan's tyre sealant is basically the same as Vittoria Pit Stop but not in a pressurised can? If you haven't seen Pit Stop before, it is a white milky liquid and stays liquid when it's inside the inner tube. I guess it's contact with outside air which makes it dry/cure.