Surface Prep for Acid Concrete Stains

Surface preparation is very important before applying acid concrete stains. It must be done thoroughly for successful results. All foreign materials need removed for optimum stain penetration.

If the concrete is new, allow a month of curing time before applying stain. Some manufactures recommend 45-50 days. If you plan on staining concrete that hasn't been installed yet, talk with the contractor about curing methods other than liquid sealers. New concrete without sealer normally can just be rinsed with clean water.

For older concrete, the surface must be free of sealers, oil, grease, dirt, rust, mold and mildew, and anything else that may inhibit stain penetration ( removing stains). I recommend using a power washer, but if you don't have access to one, use a brush and scrub with water and detergents. DO NOT USE MURIATIC ACID or any other acidic solutions. Wet the surface again and look carefully for any water beading up on the surface. If you find areas that do bead, wash these areas again. If water won't penetrate, stain won't either.

If you're staining a smooth surface such as a basement or garage floor, you probably need to sand the surface.Sanding with 60-80 grit sandpaper will help open up the pores which allows the floor to accept the stain more easily. You can also use a floor sander or grinder. But be careful not to overdue it. You don't want to expose any of the aggregates in the concrete or leave any marks or gouges. Keep the grinder moving in a circular motion. You may also need to apply solvents or stripping agents if your concrete has been previously painted or sealed.

If you have areas that are chipped, use a patching material made with cement for best staining results. Any patched areas will be very visible once the floor is stained. If there is too much repair work needed, then you might consider using acrylic stains.

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Surface Prep for Acid Concrete Stains