Asphalt roof primer is a quick drying, asphalt-based material designed for priming surfaces prior to application of hot-mopped or cold-applied asphalt coatings, roof cements and asphalt-based roof and flooring adhesives. High penetrating qualities help assure a firm, tough bond. Specially designed for metal edging and flashings, weathered (composition) roofing, concrete, masonry and gypsum surfaces.