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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.

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.

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.

The biggest downside of sealing concrete is that it needs to be resealed every few years. This routine maintenance can be laborious if you do it yourself and expensive if you hire a professional. Beyond that, sealing concrete can make the surface slippery, which can be dangerous with people with mobility issues, young children, or those with pools near their patios.