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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.

If your concrete stains are green in color, it indicates the presence of mold or algae—which you should address right away. If left unattended, mold will spread to other areas throughout the home. However, be careful not to disturb mold on indoor concrete surfaces and work with a local mold remediation specialist for specialized care. Once free from mold and algae, seal your concrete to eliminate pores and gaps.

Investing in stained and sealed concrete can be worthwhile and may catch the eye of potential homebuyers during resale. The look is sleek and modern, allowing new buyers to envision a versatile list of home decor options. Stained concrete floors are also easy to maintain and feature a custom look that stands out compared to gray, unsealed concrete surfaces.

You primarily need to be concerned about the moisture level in concrete when you are dealing with a basement or other below-ground part of your house. If you find any indication of moisture in your subterranean space, consider calling in a professional for further testing and moisture control solutions.