Isonit GL 20 is a water-based roof coating designed for concrete roof tiles, fiber cement, and fiber cement slates, as well as primed steel roofs. It offers extensive coverage and is not recommended for clay tiles or natural slate. The coating provides outstanding adhesion, dries quickly, and exhibits good flow and leveling characteristics. It forms a water-resistant surface that allows water vapor from within the material to pass through. Additionally, it is resistant to light and weather changes. It is intended for exclusive use in industrial and professional settings.