Builders Bitumastic Coating BS-90 500ml (AC1907) is a high-performance bitumen-based coating designed for sealing and protecting surfaces from moisture and corrosion. Ideal for use on concrete, metal, and masonry, this waterproof coating provides excellent durability and resistance to water damage, making it perfect for foundations, roofs, and underground structures. The 500ml size is convenient for smaller projects, providing easy application with a brush or roller. This versatile coating also offers protection against rust, offering long-lasting performance and ensuring the integrity of surfaces exposed to harsh weather conditions.