Karnak #298 Alumin-R provides the membrane with good weathering and elongation properties and reduces roof surface temperatures. Karnak #298 Alumin-R is a single component, SBS rubber modified asphalt, and is specially formulated with aluminum pigment to be used as a reflective elastomeric coating with modified bitumen membranes, B.U.R., properly sloped residential concrete roofs and primed metal surfaces. The strength and elastomeric qualities of Karnak #298 Alumin-R combined with its reflective properties, enhance the coating's ability to resist movement.