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Whether it's better to stain or paint concrete depends on your budget, desired aesthetic, and DIY skill level. Generally, staining is a more durable option because the stain soaks into the concrete's surface and won't wear away like a topical paint coating. Painting concrete can trap moisture underneath the paint layer, which may cause the concrete to deteriorate over time. However, concrete paint offers a wider variety of colors, is typically easier and less expensive to apply, and is effective at covering up existing stains or blemishes on the surface.

Yes, you can seal old or existing concrete, but proper preparation is crucial. The concrete surface must be clean, dry, and free of any incompatible old sealant. To check if an old sealer is present, drip a few drops of water onto the surface; if the water is absorbed in under five minutes, it's ready to be resealed. If you plan to use the same type of sealer that was previously applied, you may not need to remove the old layer. However, if you are using a different type of sealer, the old one must be completely removed. Before applying the new sealer, thoroughly clean the concrete and repair or fill any cracks to ensure a smooth, well-prepared surface.

Polished concrete gets its glass-like finish from several rounds of polishing, using increasingly finer grit diamond grinding pads. The concrete’s hardness will determine which grits you need to get your desired finish. The densifier and sealer also contribute to the look of the final floor, so either talk to a concrete pro (or hire one) to achieve the right concrete floor finish.

To prep a floor for painting, start by sweeping and cleaning any loose debris that could puncture the protective material. Take out as much furniture as possible. Then lay plastic, canvas, rosin paper, or masonite sheets across the room, securing them at the edges with masking tape. Plan your painting so that you minimize the chances you’ll step in and track any splatters.