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The 5-gallon Drylok Extreme Sealer is the latest generation of waterproof coatings. The flexible encased polymers squeeze into the masonry for the best waterproof protection. This latex-based product has a minimal odor and cleans up readily with water. It’s been developed with an environmentally friendly green biocide to combat mildew growth on the dried paint coat. Radon gas penetration is also minimized. It has been tested against ASTM D-7088 hydrostatic pressure at 15 psi and ASTM D-6904 wind-driven rain resistance. Masonry walls cinder and concrete blocks stucco brick retaining walls basements and foundations can be sealed with Drylok extreme 5 gallons.