Check the listing for details. Engrave-A-Crete RAC (Acid) Concrete Stain-Sample Kit 16oz each. Condition: New. Listed at 198.95 USD. Contains 1 of each 12 colors 16oz bottle per color About Rac Stain RAC Stain is a single component solution of acidic metallic ion particles, which when applied to concrete, chemically reacts with the particles in the cement (free alkali) to form oxides in the pores of the concrete. These oxides become a permanent part of the substrate to create a colored translucent, variegated and sometimes marbleized effect. The art of RAC Stain is that no two slabs will ever color exactly the same, the texture of concrete, age and dilution ratio affect final color appearance. The translucence of RAC Stain also allows the many unique characteristics of the slab to show through. Every project is a unique piece of art.CoverageAmount of square footage stained per 16oz bottle varies with the surface texture of the concrete, temperature of the concrete, and ambient conditions. Approximate ranges are as follows. 13-63sq ft. Can dilute up to 4 parts water to 1 part stain.** Dilute with distilled water only.**The higher the dilution ratio the lighter the resulting color will be.Special ConsiderationsColor VariancesAdditional colors can be achieved by mixing multiple colors together.Color samples are a representation only and do not guarantee the final color to be an exact match. A test area is recommendedon the jobsite to determine actual color.Use only distilled water when diluting RAC Stain. Read TDS and MSDS prior to using this product.