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.