Polyurethane based, liquid applied water proofing material, cures with contact with air moisture to form a seamless, elastic, crack bridging and walkable waterproof membrane. The cured membrane has high adhesion strength to construction materials like concrete, masonry, plaster and mortar. Polyurethane based waterproofing materials provides high flexibility, fulfils needs in different functions such as membrane, coating, mastic and sealant. Polyurethane materials are suitable in fill the gaps and cracks formed in the walls or floors of buildings such as tunnels, bridges, concrete.