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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.

Epoxy tends to be the most durable concrete finish, holding up on garage and shop floors for years. Epoxy seals the slab's surface, will run into any cracks and crevices, and can help to level the surface, so it tends to be a durable finish for most applications. The downside to epoxy is that it can be difficult to remove once applied.

To properly maintain an epoxy garage floor, regularly sweep up dirt and debris using a broom and dustpan or a vacuum cleaner. Mop with warm water and scrub away stains using a mild cleaning solution that's safe for the epoxy product you have installed. Don't use any soap-based or chemical cleaners, as these can cause the epoxy surface to deteriorate more rapidly.

Sealing resurfaced concrete is not an absolute necessity. However, it is recommended, and in most cases, a high-quality concrete sealer can protect the surface from stains as well as water penetration, extending the life of the resurfacing material. Some sealers are formulated to protect pigments from fading due to UV exposure. Sealer tends to enhance the colors in decorative resurfacing applications, making them more vibrant and richer compared to the duller, more faded appearance of concrete colors without sealer.