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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.

Apply two coats of paint to a garage floor after priming for optimal results. The first coat serves as a base layer, providing adhesion and coverage. Allow the first coat to dry thoroughly before applying the second coat, typically after 12 to 24 hours. The second coat ensures even coverage and durability and enhances the floor's appearance. Additionally, applying two coats helps to create a more substantial barrier against stains, chemicals, and wear and tear, resulting in a longer-lasting finish. 

The cost to overlay or resurface a garage floor averages about $3 to $9 per square foot, depending on the preparations involved, the size of the floor, and the type of finish. Some decorative topcoats like stamped concrete and ornate overlays can cost from $7 to $20 per square foot, depending on the complexity of the design and finish.

When properly installed and maintained, concrete floors can last from 50 to 75 years or more. The longevity depends heavily on the finish and maintenance routine. For example, polished concrete floors can last 50 years or longer but require periodic refinishing or resealing every 5 to 20 years, depending on foot traffic. To maximize the lifespan of any concrete floor, it's crucial to have it installed by a licensed professional, ensure it is properly sealed to prevent damage, and perform annual deep cleanings.