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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.

Commonly used in garages, epoxy is a synthetic resin coating that goes over the top of concrete surfaces. If you’re deciding between polished concrete and epoxy flooring, the best choice depends on your needs and personal preference. Epoxy is durable and highly customizable, while polished concrete tends to require less maintenance. They’re both long-lasting with similar price points, and professional installation is recommended for each.    

While you shouldn’t use thinset mortar on its own as a floor leveler, it can work alongside other products to help level floors. For instance, you could start with a self-leveling compound, let that dry, then apply backer board with thinset mortar to help fully even out the floors ahead of laying tile.

Unlike staining concrete, painting concrete often results in chips and peeling over time. You can expect numerous touchups over the years if the concrete is in a high-traffic area. Since concrete paints are opaque, you may also find it more difficult to get the exact color results you want. Lastly, painting concrete can make it much more slippery unless you mix in an additive for traction.