An economic, high performance thixotropic bitumen paint for the anticorrosive protection of the underwater hulls of canal boats, with a satin finish. This type of product is often called ‘blacking’ and is widely used for canal boat maintenance. It has easier application properties and longer life compared to normal bitumen paints and gives excellent protection in both fresh and salt water. It has good abrasion resistance, coupled with good flexibility to resist cracking and damage. This is a bitumen-based coating, do not apply a tar-based coating (such as Coflex) over it at any time.