Technically made up from an acid base solution, wetting agents, and metallic ions, this stain penetrates and reacts with the free lime and minerals in the cement concrete mix to produce a variety of mottled colors and design effects that are permanent and will not chip or peel. It colors the concrete by chemically combining the metallic ions with particles in the concrete to form oxides, creating the variegated, mottled coloration so no two applications are the same, and there is no true uniform look to it, adding to the old world charm or modern sophistication. After prep and application, depending on the slab, stains react for approximately 4 hours, then is usually lightly stained again either with the same color or an accent. The next day we neutralize the remaining acid residues; allow the floor to completely dry and apply either our 100% solids epoxy and/or our 2 part polyurethane topcoat for rich, deep colors, and a unique floor that will last for many, many years with little to no maintenance depending on foot traffic. The colors are limited to 8-10 colors from any given manufacturer: Aqua Blue, Canyon Red, Chestnut, Walnut, Mint/Green, Bronze, Burnt Umber, Chocolate, and Black. The floor to be stained must be 100% free of any oils, sealers, or wax, or will have NO chemical reaction or color penetration. Acid Stain is transparent, so it WILL NOT hide imperfections or heavy stains in the concrete. If the concrete area is too old and/or heavily stained, a skimcoat overlay can be done first for an additional cost.