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Yes, you can seal old concrete, but proper preparation is essential. Before sealing, ensure the concrete is clean, dry, and free of any old sealant. To check if resealing is necessary, place a few drops of water on the surface; if they are absorbed in less than five minutes, it's time to reseal. If you are using the same type of sealer that was previously applied, you may not need to remove the old layer. However, if you are applying a different type of sealer, the existing one must be removed. Additionally, repair or fill any cracks to create a smooth base before you begin sealing.

Unlike paint, concrete stain won’t peel off. Instead, the color absorbs into the surface of this porous building material. While it doesn’t peel, the stain only penetrates the top layer of concrete, and as the top of the concrete eventually wears away, so will the stain. However, this process is much slower than paint peeling, especially on low-traffic surfaces.

Factors like the time of day you choose to seal the concrete, temperature, humidity, and airflow will impact drying time. To shorten the drying time, seal concrete in the late afternoon on a day with a temperature between 45 to 85 degrees Fahrenheit.

The concrete coating process typically requires anywhere from a few hours to multiple days to complete, depending on the size of the area, environmental conditions, and the specific type of coating being applied. Preparatory work, curing times, and the number of coats needed also influence the overall timeline.