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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.

If your garage floor is heavily soiled or stained, then it’s a good idea to powerwash it with a concrete cleaner before sealing. This process will remove dirt and debris to help the new sealer bond to the concrete properly, and it will also improve the look of your sealed garage floor. After power washing your floor, make sure you let the concrete dry completely before applying sealant, usually for 24 to 48 hours.

As with anything you buy, be wary of prices that seem too good to be true. Some low-cost flooring products can contain chemicals that release harmful VOCs (volatile organic compounds) in the form of fumes that can be inhaled or dust that can cause skin conditions.

Even good-quality products can be dangerous for DIY-ers who don’t take proper precautions. Always carefully read manufacturer instructions and wear the recommended protective gear when working with paints and other chemicals. You can also hire a local garage flooring pro with the experience and equipment needed to perform the installation safely with no lingering fumes or debris.

Concrete is the most popular garage flooring option because it’s durable and can stand up to the weight of vehicles. If you plan on using your garage to park your car or store heavy items, concrete is a solid option. However, if you want to convert your garage to a living space, you can choose any number of flooring options to go over the concrete foundation, including wood, tile, and even carpeting.