Originally Posted by
Carbonfiberboy
Which made me wonder - so one adds more sealant every how often, which adds more and more weight to the tire? And the old dried stuff against the tire's inner surface, what happens to that?
It's just a small amount of latex. Most of the weight of the sealant is the fluid, so once it dries away, it adds very little mass. If a big blob of latex ends up in one place, i.e. if a wheel is left sitting around without motion for a while, it's easy to remove.