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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.

The actual moisture level that is acceptable for your concrete floor depends on what primer or flooring material you plan to install above it. For this reason, you should check the manufacturer’s instructions for the exact details.

Generally, the moisture levels should be 3.5% to 4.5%, although it does vary. Some products can handle higher levels of moisture, so you should always test your concrete before purchasing your flooring materials.

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.

While there is a lot to like when it comes to epoxy flooring, there are some disadvantages for you to consider. For one, this flooring gets very slippery when wet, which means that it might not be the best option for homes with young children and older adults. Using an anti-slip coating can help.

Also, the installation period requires a long curing time of several days. Wet epoxy also releases strong smells during this curing period, which requires proper ventilation and safety gear.