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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.

To maintain concrete floors, clean them regularly with a damp mop and avoid using abrasive cleaning agents that can damage the finish. Reseal the concrete every 2-3 years to protect the surface and enhance its appearance.

Always seal concrete stain to protect against wear and preserve the color. This applies to acid- and water-based stains but not always to concrete paint. Many paints designed for outdoor use contain ingredients designed to protect and waterproof without the need for additional sealant. Fortunately, learning how to seal concrete is something most DIY-savvy homeowners can tackle.

Acid-based concrete stain is generally considered the best option because it lasts about four times as long and penetrates the deepest into concrete to give richer, full-bodied colors. If you prefer more vibrant colors, though, many water-based concrete stains are available that could provide a solution you can't find from earth-toned acid-based solutions.