Black Jack, 4.75 Gallon, Fibered Roof Coating, Penetrates, Resaturates & Protects Dried Out & Exposed Roofing Felt, Can Also Be Used On Metal Roofs & Siding, Exterior Foundation Walls & All Other Concrete & Masonry Surfaces, Easy To Use, Does Not Run Or Sag, Do Not Use On Shingle Roofs, For Exterior Use Only, Roof Should Be Clean & Dry Before Application, Approximately 35 SQFT Per Gallon, Clean Up With Mineral Spirits, Allow 48 Hours Before Backfilling.