Developed to maintain the fresh color of a newly coated roof, GacoFlex A4271 BleedTrap Acrylic Base Coat for asphalt roofing helps inhibit bleed-through of oil commonly found in substrates containing bitumen. This single component, easy to apply water-based sealer helps preserve the aesthetic and reflectivity of coatings on asphaltic roofing systems. This includes built up roofing (BUR), modified bitumen (ModBit), and smooth or granulated asphaltic roofing membranes.