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Concrete Sealers - An Introduction to Two Categories of Sealers

Despite its durability, concrete is a porous material, which means it can absorb water, chlorides, stains, and other water- or oil-based materials that it comes in contact with. By treating the concrete with a sealer, you can inhibit the penetration of these intruders while allowing the surface to breathe, so moisture within the concrete doesn't become trapped.

Generally, there are two broad categories of sealers:

• Film formers block penetration of water and contaminants by forming a barrier on the concrete surface. Many also impart a gloss or sheen, so they often are used to enhance colored or exposed aggregate concrete.

• Penetrants actually penetrate into the concrete surface to a depth of about 1 to 4 mils to increase water repellency and resist stains on absorbent concrete. Usually they provide invisible protection without changing the surface appearance.

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