Waterproofing, by definition, means to stop and prevent the intrusion of water. When looking for a waterproofing sealer, make sure the sealer can be used where hydrostatic pressure is present. Hydrostatic pressure is the force that pushes water through concrete. Most sealers can’t be used where hydrostatic pressure is present which means if you really want to use the sealer you’ve chosen, you must first apply a sealer that can stop hydrostatic pressure.
Waterproofing sealers are different than waterproofing coatings. A waterproofing sealer works below the surface to prevent water from penetrating through the concrete (from below the surface of the concrete and on a surface level. Waterproof coatings leave behind a “film” or coating on the surface and prevent the concrete from absorbing liquids on a surface level. With coatings, if water is present within or under the concrete, the coating will bubble, flake, or peel off.
Want the best waterproofing protection? Seal the concrete with a waterproofing sealer then apply a waterproof coating to the surface.