Z-PC like all polishes must be respected for what they do - polish. Polish requires some material removal to level and refine the surface.
Z-PC is designed to be used at most several times a year and it abrasiveness can be adjusted from being just a paint cleanser to a mild polish depending how one works the product, pad selection (hand, PC or rotary), pressure applied and time spent on an area.
When used properly Z-PC is a very safe product for clearcoated finishes.