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This one involving staining the concrete floors. Clean concrete with a degreaser. Mop with clean water. Dry. Apply Valspar tintable semi-transparent concrete stain (color: Onyx) using a sponge. 1-3 coats depending on how dark you want it. Apply Valspar Wet Look Sealer (high gloss finish). Enjoy!
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If the stain persists, a cleaner like Singerman Laboratories' Concrete Rust Remover is an industry favorite for removing rust stains from concrete floors. Water Stains, Mold, and Mildew. Cleaning concrete floors in a basement that is has a mold or mildew problem is different from cleaning a concrete patio with the same issue.
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Water-based concrete stains are a great alternative to acid stains. Instead of getting its colors from a chemical reaction between the acid and the minerals in your cement, the water-based stain acts more like a dye. Since concrete floors are very porous, the water-based stain is absorbed into the floor without toxic chemicals.
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To seal concrete floors, use an epoxy sealer if you want something durable that comes in a variety of colors. For indoor concrete floors that won't be exposed to oil or grease, use an acrylic sealer, which is easy to apply. If you want to seal over concrete floors that already have a seal, try a polyurethane sealer.
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Avoid staining spalling concrete; the stain will turn a darker color wherever the concrete is pitted, and you'll end up with a freckled patio. Also, if you just poured your patio, give the concrete at least 30 days to dry before you stain it.
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