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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.

Garage floor sealers last anywhere from one to 10 years on average, depending on the type of sealer you use and the traffic it’s exposed to. Acrylic sealers have the shortest longevity, whereas most other options can last anywhere from five to 10 years. If you use an acrylic sealant to protect against stains, reapply every one to two years. Reapply other types of concrete sealers every five years for the best results and maximum protection.

Commonly used in garages, epoxy is a synthetic resin coating that goes over the top of concrete surfaces. If you’re deciding between polished concrete and epoxy flooring, the best choice depends on your needs and personal preference. Epoxy is durable and highly customizable, while polished concrete tends to require less maintenance. They’re both long-lasting with similar price points, and professional installation is recommended for each.    

Whether it's better to stain or paint concrete depends on your budget, desired aesthetic, and DIY skill level. Generally, staining is a more durable option because the stain soaks into the concrete's surface and won't wear away like a topical paint coating. Painting concrete can trap moisture underneath the paint layer, which may cause the concrete to deteriorate over time. However, concrete paint offers a wider variety of colors, is typically easier and less expensive to apply, and is effective at covering up existing stains or blemishes on the surface.