5 Gallon, Gray, Water Base, Super Elasto Barrier Primer, High Strength Elastomeric Dual Rubber, Impervious To Water When Applied In A Uniform & Seamless Fashion With Adequate Mileage, Non-Toxic, Low Odor, VOC Free, Use For Waterproofing In Extreme Wet Situations Such As Flat Roofs, Used On Metal, Tar, Tar & Gravel, Built Up, Rolled Roofing, & Many Other Surfaces, Can Be Used On EDPM, Concrete, & Top Roofs If Super Primer Is Applied First, May Be Used As A Roof System With Maximum-Stretch Or Snow Seal Light Commercial/Residential Over Old Tar Flat Roofs, Tar & Gravel, Built-Up, Rolled Roofing, EDPM, Concrete, & Top, Needs To Be Top Coated If Exposed To Sunlight, Coverage: 1 Gallon Per 100 SQFT Per Coat.