I have SSR 2.5 and 1. Because of their lotion-y nature, they tend to spread on the car very thin and don't migrate around the pad a lot like some other watery polishes. Anyway, my experience is that first you start with a thin layer of SSRx, and it basically gets thinner and thinner. Sometimes I think there is nothing there, but looking with a LED light shows that there is still stuff on the surface. I talked to Steve once, and he said that you were supposed to use them like a shoe polish, e.g. polish until there isn't any left anymore. Sometimes I feel towards the end of the polishing run that I'm just just pushing a bunch of oils around.
With SSR 2.5 I do manage to get a little bit of dusting towards the end, though.
With SSR 2.5 I do manage to get a little bit of dusting towards the end, though.