Concrete sealer protects concrete from water damage and stains. There are two types: film-forming and penetrating. Sealed concrete resists corrosion, making it useful for kitchens and labs. Unsealed concrete is breathable but prone to cracking.
Concrete sealer is a compound used to protect concrete from the elements. Concrete is a porous material and without sealing it will breathe freely. It also absorbs water, which can lead to a variety of structural and aesthetic problems. Many home improvement stores carry sealants for people working on concrete projects at home, and it’s also possible to purchase them through contract suppliers and specialty companies. Concrete should not be left unsealed, except under certain circumstances.
There are two ways a concrete sealer can work. Film-forming sealants work by creating a barrier in the form of a waterproofing layer on top of the concrete. As long as the sealer is in good shape, the underlying concrete will remain dry. It is also possible to purchase penetrating sealants that penetrate the material to waterproof it. Some sealers also include a stain that is used to color the concrete, while others are clear.
The main difference between these types of sealer has to do with the appearance of the finish. If a glossy or wet-looking finish is desired, film formers should be used. Matte finishes can be achieved with penetrating sealers. Either way, you may need to periodically remove the compound and reapply it to keep the concrete in good shape. Some signs that need resealing include stains, scratches, and increased moisture in the concrete.
Using a concrete sealer prevents water from penetrating the material, reducing the risk of cracks and other types of water damage. Stains are also greatly reduced, which helps keep floors and other concrete installations cleaner. Preventing stains and moisture can discourage the growth of moss, mold and plants that may use the concrete as a substrate. Sealed concrete also resists chemicals and corrosion, making it useful for kitchens and science labs.
In outdoor installations such as driveways and pathways, some people prefer not to use concrete sealer. The breathable properties of unsealed concrete allow water to percolate, rather than flow, preserving rain, snowmelt and other water sources. Permeable walkways, driveways, patios, and other outdoor installations help keep water out around your home and garden, which can be beneficial in drought-prone regions. Unsealed concrete, however, will tend to crack more quickly, so it may need to be replaced more often.
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