19 Flashing Cement is a scientifically compounded composition of selected asphalts, mineral fibers, and refined solvents that are manufactured to a heavy consistency for application by trowel to provide a durable, elastic coating of excellent adhesion and high resistance to water and weathering. This product dries to a tough, flexible, waterproof and corrosion proof coating which gives excellent performance over wide ranges of temperature and weather conditions. 19 Flashing Cement is available in 3 consistencies: Summer, Semi and Winter.