Weathered Membrane Cleaner is used to clean both new and old EPDM membrane. It helps to loosen and remove dirt and other contaminants from the surface of the membranes and leaves a suitable surface for the subsequent application of primer. Weathered Membrane Cleaner should be used when preparing an adhesive splice. Application Weathered Membrane Cleaner is used to clean both new and in-service EPDM membrane. Coverage Coverage rate depends on the age of the membrane and the amount of dirt/debris on the surface. Assume 121 m (one surface) per gallon.