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SealBoss ® 1500 Water-Stop-Foam is a low viscosity hydrophobic water activated (hydro active) water cut-off grout and foam seal grout based on a MDI (methylene-diphenylisocyanate) polyurethane. This product is a two component formulation to be mixed at a 1:1 ration by volume. The resin is 100% solvent free and 100% solids.