The Sika® Damp Proofing Slurry Grey (20kg Pail) is a high-performance, cement-based waterproof coating formulated to protect masonry, brickwork, blockwork, and concrete from penetrating damp and water ingress. Supplied in a convenient resealable pail, this slurry provides a dense, durable barrier ideal for basements, cellars, retaining walls, lift pits, and other below-ground structures. It can be applied by brush or trowel and bonds strongly to prepared substrates, delivering long-lasting resistance to moisture, salts, and damp pressure. Suitable for both internal and external use, it is a trusted solution for refurbishment, remedial works, and new construction.