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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 cost to seal concrete is around $1,500 on average, but you could spend anywhere from $1,000 to $7,000, depending on the type of sealer used and the size of the space. You may want to seal concrete that receives a large amount of foot traffic or heavy wear. While you can seal concrete yourself with materials from a home improvement store, you must ensure the surface is clean and ready to accept the sealer. Hiring a professional is often recommended to ensure good, even coverage that provides adequate protection.

To preserve a concrete coating, routine maintenance should include regular sweeping and cleaning to remove debris and dirt, promptly addressing any spills to prevent staining, and applying a sealer as the manufacturer recommends. Inspect the surface periodically for any signs of wear or damage to ensure timely repairs and maintain the coating's protective qualities.

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.