High-performance, flexible waterproof coating for emergency roof repairs of flat roofs & gutters. Stops leaks instantly, even when applied to wet or dry surfaces. No primer required. Can be applied to concrete, stone, wood, metal, zinc, clay, tiles, slate, felt, polystyrene, and most plastics (not suitable for polyethylene, polypropylene plastics, or bitumen coatings). It is long-lasting and resists cracking, UV, and frost. Being flexible, it is not affected by temperature variations. Easy to apply straight from the tin with a brush. Quick drying and free from solvent, bitumen, and isocyanates. Contents: 1 x Bostik WATERSTOP Emergency Waterproof Coating, 1kg, Grey.