Reactive Acid Stain (RAC) Concrete Colors

Reactive Acid Chemical (RAC) stain reacts with the minerals in your concrete to create rich, marbled, permanent color. No two floors ever look exactly alike.

Acid staining is the time-tested way to turn plain gray concrete into a warm, natural-looking surface with depth you can't fake. Because RAC reacts with the concrete itself, the color becomes part of the slab rather than a coating on top, so it won't peel or flake, and it develops the translucent, variegated character prized on patios, driveways, basements, and interior floors. Choose from earth-driven tones like Black Walnut, Rich Mahogany, Golden Sand, and Weathered. After the reaction is complete, neutralize with CR-585, remove all residue, and protect the color with a compatible interior or exterior sealer. New to acid staining? Start with a sample pack and our Stain Types & Uses guide.

Frequently Asked Questions

How does acid stain work?

The stain's minerals react with the lime in cured concrete, permanently changing the color. Results vary with the age, mix, and finish of your slab.

Will every slab look the same?

No — variation is the point. Prep, porosity, and troweling all influence the final look, which is why acid stain reads so natural.

Do I have to neutralize after staining?

Yes. Neutralize with CR-585 Surface Neutralizer, then be sure to remove all residue before sealing so the sealer bonds properly.

How many coats or how much do I need?

Coverage depends on porosity; most projects use one to two applications. Order a little extra for testing and touch-ups.