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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.

Other garage floor concrete sealers besides epoxy include solvent-based acrylic and polyacrylic sealers, quick-drying polymer or polyurethane sealers, and scratch-resistant polyurea floor coatings that are ideal for exterior applications. These sealants come in basic clear forms and more decorative options, varying in price accordingly.

Concrete sealers will help your garage floors resist water, but they will not make the floor waterproof. You will need to purchase a specific waterproof floor paint for concrete and apply several coats over several days if you want your garage floor to be truly impermeable. While the process is similar to sealing the floors, the materials are different, and the need for multiple coats will extend the process and drying time.

Epoxy paint is a popular option for concrete due to its durability and stain resistance. You can also use masonry paint, which adheres well to concrete. Acrylic paints are more affordable but not as durable. Concrete stain is another option, which is more durable than paint and won’t peel over time.