An asphalt-based material designed for priming surfaces prior to application of hot-mopped or cold-applied asphalt coatings, roof cement, and asphalt-based roof and flooring adhesives. Forms a tough waterproof seal that traps and encapsulates dust and other loose particles Creeps into cracks then sets-up and bonds to surfaces Rust preventative Applications: metal edging and flashings, weathered (composition) roofing, concrete, masonry, and gypsum surfaces.