Polyurethane Waterproofing Used to waterproof box gutters, retaining walls, roof detailing, complex spaces and non-potable dams, Duram 195 provides a seamless coating. It is suitable for permanent immersion in water and requires minimal maintenance. Premium polyurethane waterproofing coating. Exceptional strength and flexibility (elongation > 300%). Adheres well to most surfaces. Provides seamless waterproofing. Suitable for permanent immersion in water. Easily waterproof complex and detailed spaces. Minimal maintenance required. Quick and easy to apply. Duram 195 is a single component, high performance polyurethane waterproofing coating with exceptional flexibility.