Diamond grinding is a surface preparation and polishing method that uses discs embedded with industrial diamonds to grind down a concrete floor, used both to prep a slab for coating and to polish concrete to a smooth, glossy finish.
Diamond Grinding for Surface Preparation
Before installing an epoxy or polyaspartic coating, contractors often grind the slab with coarser diamond grits to remove old coatings, laitance, and surface contamination while opening up the concrete’s pores. This creates a mechanical profile that gives the new coating something to grip, which is critical for long-term adhesion. Grinding is generally preferred over acid etching because it produces a more consistent profile and does not introduce chemical residue into the slab.
Diamond Grinding for Polished Concrete
For polished concrete floors, the process continues well past surface prep. The installer works through a sequence of progressively finer metal-bond and then resin-bond diamond tooling, often paired with a chemical densifier partway through, until the surface reaches the desired level of sheen. The finer the final grit, the higher the gloss and the smoother the floor feels underfoot.
Practical Tips for Diamond Grinding
Match the grit sequence to the goal. A coating prep job usually only needs a few passes with coarser grits, while a polished floor requires working through many steps in sequence without skipping grits. Keep the grinder moving to avoid grinding uneven low spots, and always vacuum or wet-slurry the dust as you go, since dry grinding without dust collection creates a serious silica exposure hazard.
