Bituminous Waterproofing Ideal for cement dams, water features, gutters and behind tiles in bathrooms and kitchens. Also for non-exposed areas such as retaining walls and cavity walls, and can be used on roof joints and screws when coated with a UV protection coat. Forms a tough, flexible waterproof barrier. Suitable for permanent immersion in water. Excellent adhesion and can be used on most surfaces. Can be built up to a thick, non-sagging coating. Excellent weathering and ageing properties when coated with a bituminous aluminium coating. Does not affect or taint water once dry (one initial flush is recommended). Forms a thick, durable waterproofing barrier suitable for long-term immersion in water, and is ideal for water features, box gutters, behind tiles and for retaining walls.