Water seepage in construction poses an enduring obstacle that necessitates swift and effective solutions. B2-Fix PU3000 represents a transformative advancement, offering a comprehensive strategy to combat water ingress through its unique single-component flexible pre-polymerized polyurethane water-reactive foam. This innovative injectable hydrophilic polyurethane water-stop resin initiates a rapid reaction upon contact with water, producing a resilient closed-cell foam that efficiently seals off any leakage passage.