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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.

Yes, it is possible to apply a concrete coating yourself, especially for smaller applications if you have the proper equipment. However, for larger projects, a professional application is recommended to ensure durability, slip resistance, and proper adhesion.

You can seal a concrete slab by cleaning the surface, filling in any cracks, etching the surface, applying a sealer, and letting it dry. Concrete slabs don't typically need sealing, but you can use a topical concrete sealer if you notice signs of water damage. If you haven't already fixed the cause of the leak, then you'll want to repair the plumbing before you seal a concrete slab.

Yes. So-called “floating” cork floors can be installed over concrete subfloor, though a polyethylene vapor barrier is required. This type of installation is achieved using the glue-down tiles, which are trickier for a DIY approach, so consider calling a professional to help you if you’re planning to install your cork floor over concrete.