MicroGrout Mix is a polymer based polishable micro-grout mix designed to be applied very thin with a squeegee or magic trowel and slicked off, to just fill in micro-holes and other small imperfections on floors, counter tops, or other smooth high traffic substrates. You then polish the surface one more time. Filling the micro-holes helps reduce pitting, or bubbles from the air entrapment in the holes that escapes when applying your final sealers, epoxy etc., over the polished surface.