750ml Polyurethane Foam Sealant PU Foam for Construction Gap Filling Bonding Leak Repair Advanced formula delivers Class 0 mildew resistance, effectively inhibiting mold and bacteria growth in damp environments. Integrates door/window installation, gap filling, bonding, waterproofing, leak repair, insulation, and soundproofing in one product. Forms a dense, closed-cell foam layer that blocks heat transfer and reduces noise transmission, improving energy efficiency and indoor