E*thirteen says that they tried them all and were so disappointed with the current crop of tubeless tire sealants that they decided to formulate their own. It's called Tire Plasma, and it looks and smells a lot like Stan's. According to e*thirteen, the stuff is made from a specially formulated acrylic polymer emulsion, which is water soluble and, reportedly, much kinder to people, tires and rims than other leading brands.
Water based acrylic polymer emulsions include a large family of products, like paint, art supplies, industrial sealing products and tubeless tire sealant - which is probably why Tire Plasma smells (and looks) very much like most other tubeless tire sealants. The devil is in the details. Whether it's finely ground Unicorn Kashmir or simply sawdust, nobody's tellin' - so we are left to imagine the secret ingredients inside e*thirteen's sealing potion. Tire Plasma is sold in one-liter bottles for $17.95, in the single-serving (one MTB tire) 120ml packet reviewed here for $4.95, and in a ten-pack of single-serving containers for $39.50. e*thirteen
Well, there's a lot to like about Tire Plasma, The single-serving package is going to be emptied into one tire by most users, but if you are the gravel-grinding type, the package is resealable, so you can save some for a second tire. Other than that, e*thirteen's tubeless sealant seems like any other in every way. To discover whether it was better than regular Stan's, I poked holes in identical 2.3-inch tires at 26psi with a four-millimeter Allen wrench (e*thirteen's literature states that it will seal holes up to 4mm). Well, OK then - Tire Plasma had the hole sealed in three revolutions, but so did Stan's. I'll give the decision to e*thirteen, though, because there was slightly more dribble from the Stan's tire. Tire Plasma, like Stan's, doesn't produce the thick, rubbery film that Orange brand sealant leaves (and the occasional congealed wad on the bottom when the tire is left standing too long). While some riders believe that lots of gack inside their tires is a good thing, I prefer that my tire sealant remains liquid until it finds a puncture, which, so far, seems to be the case with e*thirteen's formula.