EDCO Concrete Floor Grinders improve concrete surfaces by removing deteriorated coverings, eliminating imperfections and preparing slabs for new overlays. EDCO’s newest grinder accessory, the PCD Dyma-Sert, uses polycrystalline diamonds to aggressively strip hard and soft coatings from concrete surfaces. Thick coatings of urethane, waterproofing membrane and epoxy are no match for the PCD Dyma-Sert.