Johns Manville Bestile Utility Cement is a trowel grade mastic compound designed for use in the construction of professional roof flashings and details for built-up roofing. This material is a blend of selected asphalts, fillers and petroleum solvents. It has the necessary body and resilience for maintaining bond during varying temperature and weather conditions. This product adheres to dry surfaces, has a high resistance to weathering and provides excellent durability against stresses and wear.