I have found the semantics of "clearcoat safe" used by the manufacturers of these products interesting, because they can be misleading to the layman. Many polishes (even compounds which is even more curious ) are labled as 'clearcoat safe' even though they obviously contain abrasives, which, if used improperly CAN damage clearcoat paint, at least to the point of requiring additional abrasives and techniques to straighten out, which maybe leads to a false sense of security for the inexperienced that think it won't dull or cut paint. Abrasives are abrasives to some degree, albiet perhaps not as harsh as what our grandfathers used in the 50's etc. Paint and technology has indeed changed.
Also, as Forrest stated, it has to to with engineered particle size and material composition, that is "safe" and effective when used per lable instructions. "Safe' is where the semantics get nebulous though, because we all know people can mess up paint with even the finest grit polishes if used the wrong way.
Some of it is also for marketing and sales, because, when automakers switched over from single-stage finishes to base/clear, the store shelves started seeing waxes and products labled as 'clearcoat safe' (even though most waxes etc. ostensibly were prior) in order to convince the public that buying their product was allright. It is true that rubbing compounds and some polishes were engineered differently prior to clearcoat, so there's a basis of truth to seeing that lable as well as some marketing reassurance to keep skeptical people from looking at another product that maybe states it. Of course, I'm only theorizing on that part though.
That's my take on it anyhoo.
