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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.

The biggest downside of sealing concrete is that it needs to be resealed every few years. This routine maintenance can be laborious if you do it yourself and expensive if you hire a professional. Beyond that, sealing concrete can make the surface slippery, which can be dangerous with people with mobility issues, young children, or those with pools near their patios.

The cost to overlay or resurface a garage floor averages about $3 to $9 per square foot, depending on the preparations involved, the size of the floor, and the type of finish. Some decorative topcoats like stamped concrete and ornate overlays can cost from $7 to $20 per square foot, depending on the complexity of the design and finish.

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.