Antiozonants keep your tires from turning brown. Tire manufactures put antiozonants into the rubber before making the tire. The antiozonants the tire manufactures put into the rubber is designed to work its way outward as the tire spins as a way to constantly replenish itself on the exterior surface as it is used up, breaks down and leached out.
Using strong tire cleaners, or strong wash solutions, like Dawn, leaches this antiozonant out of the rubber accelerating deterioration.
Endurance contains antiozonants, plus trade secret conditioners, plus a polymer that cures to the surface.
Some people love Endurance some people hate it.
I like it because it turns my tires dark black and keeps them that way for a long time. The way I use it is to apply, allow to penetrate and cure, then after a while, wipe off any excess residue with a terry cloth towel.
I don’t like the wet, shiny look, I prefer the dark satin matte finish. So I usually opt for the Enduracne and not the Endurance High Gloss.
There is much more complex action taking place than I just described, but when the chemist explains it to me, I usually get confused.
I’ll try to take notes next time.