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How do you paint a rusty concrete?

Updated: 11/20/2022
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13y ago

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Rusty concrete is there such a thing?

If the concrete is rusty because it was stained by steel laying on it, that will be easy. Clean the concrete with some muratic acid (follow the instructions on the jug), rinse it, then paint it with concrete paint. Your local hardware store can provide different colors and options depending on the product line(s) they carry.

If your concrete is rusty because the rebar is rusting and the rust is bleeding through, you have a problem. You need to remove all of the spalling, loose, and unstable material from around the rebar and then patch the spot. You might be able to prep the area with a pressure washer or you might need a cold chisel. Rusting steel rebar destroys concrete because it swells and splits the concrete.

The surface needs to be sound before you paint. Painting is easy, surface prep always takes the most time.

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