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Oil-based waterproof masonry paint from Rust-Oleum's Zinsser brand — one of the most trusted names in basement waterproofing since 1849. Contains an EPA-registered mildewcide that prevents mold growth on the coated surface. Fills hairline cracks up to 1/16". Forms a rigid barrier that resists up to 34 PSI hydrostatic pressure. Suitable for both positive and negative side application.
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