Monolithic Membrane 6125® (MM6125®) is a thick, tough, flexible, self-healing membrane for use in waterproofing. MM6125 is a special formulation of refined asphalts and synthetic rubbers. MM6125, the original hot fluid-applied rubberized asphalt membrane, has been successfully used worldwide by leading architects, engineers and owners on all types of horizontal and vertical structures including plazas, parking decks, planters, tunnels, bridges, mud slabs, foundation walls and roof areas...establishing an unbeatable track record of 60 years.