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Acid etch is a method of treating the surface of a material, usually concrete, after it has fully hardened and cured. The process involves applying a solution of acid to the surface, which reacts with the minerals in the concrete to create a textured and more porous surface. This can improve adhesion for paints, coatings, or other finishing materials, and can also be used to add decorative patterns or designs to the concrete surface. However, acid etching can also be a hazardous process and must be done with proper safety precautions and regulations.
