Can I Acid Stain Old Concrete. Concrete acid stain is a great way to add color to new and old concrete floors. It's not a paint or a coating, it's a process involving a chemical reaction between the acid stain and the cementitious materials in the concrete. Water first and acid or from some of the conversations on the web page, i gathered that i could put two parts muriatic acid (a common cleaner for concrete and mortar) into.
Never expect concrete acid stain to have a consistant or versatile textures, such as veining and mottling, will become apparent when you seal the concrete with wax. Acetone based dye/stain or water based stain? It does not contain the reactable material the stain needs to generate color.
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If you are planning on acid staining an old concrete floor that has been poured a long time ago, the first thing that should be done is to test the concretes porosity. Metallic salts in the acid stain chemically react with limestone in concrete. Acid stains give concrete a mottled, variegated. The acid in the acid stain is (mostly) neutralized by the alkalinity in the concrete.