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Block Wall Liquid Rubber is a waterproofing sealant for below grade walls and interior applications. It is impervious to water when applied in a uniform and seamless fashion with adequate millage. Nontoxic low odor radon blocker VOC volatile organic compound free. It is heavy-duty yet easily applied by brush roller or sprayer. This product is formulated to resist fungus mold and mildew. The subterranean applications system will withstand up to 100 psi pounds per square inch water pressure. Potable water compliant. Cleans up easily with water. Shake or stir prior to use. Coverage: 1 gal gallon per 100 sq ft square foot per coat.