Gallon, Black Jack, Cold Process Adhesive Blind Nailing & Lap Cement, Can Be Used To Bond A Variety Of Roofing Materials, Including 45#, 55# & 65# Smooth Roll Roofing, 90# Slight Surface Roofing Felt, Glass Cap Sheets, Selvedge Felts, Glass Fiber Mats, Polyester Membrane, Eliminates Use Of Hot Asphalt, Forms Excellent Cohesive Bond, For Exterior Use Only, 5Gallons Will Cover 325-500 SQFT Clean Up With Mineral Spirits, Cure Time 24-48 Hours.