GAF Brush-Grade Acrylic Flashing is a water-based, high-solids acrylic sealant utilizing the latest advances in acrylic technology. Its thick, buttery consistency allows it to be easily worked into vertical seams on metal roofs, into gaps in flashings, around protrusions, and into heavily alligatored areas in weathered asphaltic roofing. (formerly known as United Coatings™ Roof Mate™ Butter Grade Flashing)