Permanent Concrete Sealer™

New Concrete Application

New Concrete will do most of it's curing in the first few weeks, as the capillary network and bleed holes show their developnent. The strength of concrete slowly continues to increase over the next few years, as a microscopic crystalline network develops. For this reason, we recommend that the application of the sealer to new concrete be repeated a year or two later in cases where absoutely no porosity in concrete may be tolereated. As concrete cures it will develop new porosity, regardless of how well sealed it was initally. knowing this, the contractor can properly inform his customers and avoid call-back and or future headaches.

Old Concrete Applications

Old concrete is chemically stable and its porosity fully developed. The typical age at which chemical stability is attained and chemically-bonded coating will stick depends on average annual temperature. All chemical reactions go faster in warmer weather. Because our 100% Acrylic-free formulation, based on the mineral chemistry of concrete itself, it will even stop salt water deterioration of concrete pilings if the sealing is done properly and the concrete is steamed cured before installation. Dusting and efflorescence of old concrete surfaces can be stopped entirely. However old or extremely porous may take more than two or three applications until no further penetration observed. Extremely porous, crumbly concrete shoud have an epoxy sealer treatment instead. Most coatings can be made to stick to concrete with proper suface preparation, then they stay stuck.


Old concrete which may have absorbed food spills, grease or oil, antifreeze, brake fluid or hydraulic fluid will not stick if not chemically cleaned. Abrasive blasting does not remove soaked in comtanimation, and such oily residue will dissolve in and come to the surface when the first topcoat is applied. This is why precleaning is necessary.

The powerful detergent combinations in Smith's Permanent Concrete Sealer flushes oils or dirts from concrete porosity. This chemical surface treatment will also seal the microscopic porosity of the concrete. It also chemically activates the concrete and silica sand grains in the surface so that a good chemical bond may be obtained with sebsequent coatings.

To use, mix two gallons of concentrate with three gallons of water. Apply Smith's Permenant Concrete Sealer at a coverage of about 50-200 square feet per gallon, depending on concrete porosity. Apply as much as immedately soaks in. The average concrete slab takes about 100 square feet per gallon. One should apply as much as will soak into the concrete. It is then covered with a platic sheet to prevent water evaporation. Do NOT let any of the sealer dry hard on the concrete surface; it will be difficult to remove and will interfere with adhesion of subsequent coatings. The seal developes by a chemical reaction with the concrete and this is at a fairly slow rate. Keep covered for five hours. The Plastic sheet is removed and the concrete is rinsed with tap water while being scrubed with a stiff bristle brush or push broom.

At this point the concrete surface should show water standing, not soaking in. This proves it has been sealed against liquid water and oil absorbation. It can still pass water vapour, however. The seal is based on a minereal kind of chemisty similar to the concrete itself. Acrylic-emulsion-type sealers and organic silane sealer biodegrade and weather away, and need to be repeated. Our technology is 100% Acrylic-free, and on fully cured concrete, this seal is permanent. This treatment is sufficient to seal concrete against efflorescence. The cause of efflorescence the white stains commonly apearing on concrete, is dissolved minerls left behind when ground-water evaporated form a brick or concrete surface. When the concrete surface is treated in this manner liquid wated cannot reach the surface. The sealer passes vapour only, thus evaporation of the water takes place below the surface. The dissolved mineral are deposited within the concrete below the surface where they connot be seen and actually contribute to further sealing the densification of the bulk porosity of the concrete.

Smith's Permanent Concret Sealer is complety safe when used as directed. It leaves no toxic residue whatever and may be used in bath and shower areas where bare concrete must be sealed to prevent water intrusion to the sheetrock and wood behind grouted-tile surfaces. It may also be used on concrete surfaces which hold animal food or in food preparation areas. Regular sterilizations with steam or hydrogen peroxide will not affect the seal or the surface.

Some stucco or sprayed concrete surfaces exhibit higher porosity, and after the usual procedure some absorption of water may still be apparent. Concrete blocks are an extreme example and this sealer should not be used on such surfaces.

Below grade concrete basement wall may be sealed from the inside, providing the work is done during the dry season, when ground water is not flowing. Flowing water would prevent sealer penetration. Actual cracks in concrete may be sealed with rubber sealants. If the concrete slabs have absolutely no capability for movemet , epoxy or cement grouts may be used to seal cracks.

White or colored stains or powders may develop on the surface in the days or weeks after Sealer application. The particular history of the concrete is responsible , and this cannot be predicted in advance. Application on a small test area is recommended, where the concretehas an unknow history and final apperance is of concern.