Fibered repair mastic, designed to patch roof surfaces. Use in wet or dry conditions to seal and stop leaks around flashings, skylights, vent pipes, chimneys and valleys. For the repair of cracks, seams, and holes in all roofing materials.Can be used below grade as a heavy duty foundation water-proofing and damp-proofing. Thick trowel grade. Covers approximately 12 sq ft per gallon when applied 1/8" thick.