Bakor 810-21 is a solvent-type rubberized, plastic cement composed of asphalt, fiber, solvent and fillers. The asbestos-free formulation provides weather resistance, flexibility and ease of application. Bakor 810-21 is used as a weatherproofing compound for seams, joints and cracks and for repairing roofs, flashings, vents, copings, drain pipes eaves, skylights and parapet walls. It also is used for cementing down loose shingle tabs. Bakor 810-21 can be applied to wet surfaces and dries to a tough, water-resistant sealer.