In general,coarse diamonds will cut through coatings better than fine diamond segments which tend to clog up with the coating material. There should be enough bite in the size of the diamond to penetrate the coating and score it, so a 30-50 grit is recommended. For thicker coatings, grits down to 16 can be used successfully.

If the concrete diamond tooling is removing the coating productively then keep using it, but if it slows down you need to look at two things.

1.Perhaps the concrete is too hard and the diamonds are blunting which means you need to choose the same grit diamond tooling in a softer bond.

2.Or maybe the coating is too thick so you need to change to a PCD removal tooling to grind it off. This PCD tooling has small blocks of the diamond.

Concrete hardness and coatings:

To grind off most coatings the diamond tooling needs to grind into the concrete floor below the coating. The concrete will keep the diamonds sharp and exposed if the bond is correct for the concrete, while also removing the build up of coating that accumulates on the segment. When you have a diamond bond that is too hard for the concrete, the diamonds will blunt and not cut into the coating properly. At this point operators who are unaware of the problem will blame the diamond tooling for not being able to remove a coating, but it has little to do with the coating and more to do with the hardness of the concrete.

When removing coating of a concrete floor, your options are to try coarser diamonds, or to try a PCD coating removal tool or to take smaller bites into the coating each time. PCD removal tooling can be useful to remove most of the coating over a surface and will not damage the concrete floor. This type of tooling is very powerful and aggressive for fast remove mastics glues, membranes and epoxy coatings. Therefore, PCD removal tooling will perform most successful on hard concrete as well as soft bond, extra coarse diamonds down to16 grit diamond tooling. And coarse diamond 30-50 grit with the right bond will be better on soft to medium hardness concrete.