Seal-Once NPW is a silica hydrogel that reacts with the free alkali within the concrete to form a gel that fills the capillaries within the substrate and pushes out harmful chlorides. This hydrogel waterproofs and seals the concrete surface. Seal-Once Negative Pressure Waterproofer is a non-flammable, non-toxic, non acid sealer that strengthens and waterproofs cementious materials. It reduces and blocks vapor emissions but still leaves the concrete breathable.
All surfaces should be cleaned before sealing for best penetration and performance. Clean all dust, debris, and loose material. Remove oil, grease, algae, grime, mold and mildew stains with Seal-Once Concrete and Masonry Cleaner. After cleaning, test absorbency or surface by sprinkling a few drops of water on the surface. If the water does not readily penetrate the surface the surface stripping will be necessary. We recommend Franmar 605PRO Stripper with Safenol.
On Smooth Slab: 250-300 SF per GAL
Allow 24 Hours before Applying any topcoat or flooring
Click here for this product’s Safety Data Sheets (SDS)
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