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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.

Sealing resurfaced concrete is not an absolute necessity. However, it is recommended, and in most cases, a high-quality concrete sealer can protect the surface from stains as well as water penetration, extending the life of the resurfacing material. Some sealers are formulated to protect pigments from fading due to UV exposure. Sealer tends to enhance the colors in decorative resurfacing applications, making them more vibrant and richer compared to the duller, more faded appearance of concrete colors without sealer.

Resurfacing a garage floor takes about eight hours on average, with another couple hours over three days to do the epoxy. Epoxy goes on in three coats, with each coat taking 24 hours to dry and cure. You’ll need to keep foot and vehicle traffic off of your garage floor for around 4 days in total when replacing your garage floor, so be sure to plan ahead before you start. This is a great time to organize your garage since you’ll need to move everything out to apply the epoxy.

Sealing a concrete surface protects it from damage caused by water, chemicals, and general wear and tear, making it last longer. A good sealer acts like a shield to prevent cracks, stains, and deterioration. Plus, it enhances the appearance of the concrete, giving it a fresh, polished look that can boost your property’s curb appeal.