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Concrete treated with a sodium silicate solution helps to significantly reduce porosity in most masonry products such as concrete, stucco, plasters. A chemical reaction occurs with the excess Ca(OH)2 in the concrete that permanently binds the silicates with the surface making them far more wearable and water repellent. Apply a solution of sodium silicate, diluted 1 part silicate with 4 parts water by brush or low pressure sprayer.  Depending on porosity of concrete etc 2 or 3 applications may be necessary. Please Note that concrete and masonary surfaces may appear darker after treatment.