The surface must be clean before we start. Epic Epoxy Floors will clean all excess oil and grease spills, scrape and sweep away any dirt or loose contaminants from the surface. We will ensure no sealer or coating is present by applying the proper concrete cleaning products or utilizing our diamond blade concrete grinder for more extensive preparation work. We do not use an acid wash on the concrete primarily because this will deplete the lime content in the concrete, which is exactly what is necessary to form a chemical reaction with the stain. With chemically stained floors, the consequences of substandard cleaning can be difficult to remedy. Unlike paints and coatings for concrete, which are opaque and can disguise many evils, acid stains are transparent. Any unwanted residue remaining on the floor is likely to show through the newly applied stain.