What is the idea behind a tubeless sealant? It's understood that it forms a viscous thin film that is pushed from the inside out, closing all micro-pores in the rubber and in the tiny gaps between the rubber and the rim.
But do tubeless sealants remain a highly viscous liquid or do they form a thin rubber film?
Obviously whatever bond is formed must be detachable so that it can be ripped or cut the next time the rubber is replaced, but do some kinds of sealant ever solidify, effectively bonding the rubber to the rim by forming a temporary glue?
If the solidification (whether it's polymerization or something else) results from particles speeding as a result of spraying—it cannot result from exposure to (a lot of) air, since the liquid is perpetually swirling inside the tubes surrounded by air—then the (latex?) accumulation will remain on the exterior of the hole, which is not a recipe for a lasting repair, since the exterior is being constantly abraded. This suggests that there must also be some complementary effect happening, perhaps the mechanical squeezing of particles in pores.
I'm also curious whether they disclose a minimum for our safety. The recipe may well be a trade secret, but they still need to warn us if skin/eye/inhalation exposure poses a health risk.