Rockcote Keycote is a cementitious polymer modified adhesive base coat manufactured to exacting conditions from high quality, washed and graded sands, off white Portland cement and proprietary additives conforming to Australian Standard 3972. Rockcote Keycote is ideal for use as a base coat over fibro cement sheets, provided that a minimum of 2mm dry film build of Acrylic Render is used as a finish coat. Rockcote Keycote can provide a very strong adhesive bond to difficult substrate surfaces such as smooth masonry and clay block surfaces, and properly cleaned and prepared pre-painted surfaces, prior to the application of cement based renders.