For a smoother finish consider using our Dyma-Dot Diamond Tooling. The Dyma-Dots do not work as fast as the Dyma-Segs nor are they best suited for heavier grinding of concrete but they will leave the smoothest possible finish.
For thicker coatings that are more brittle it's preferable to chip them off rather than grind them from the top down. This will yield better results and save considerable time. Our Dyma-PCD Carbide Tooling is the best choice for this type of work. Note that for thinner coatings chipping doesn't work and you'll be best served with the Dyma-Dot tooling.