Henry HE087 Duratuff is 100% Acrylic Polymer chemically engineered to modify #127 DuraSeal^® pavement sealer to achieve outstanding toughness, faster curing time, and superior UV protection.  HE087 Duratuff also enhances the jet blac color of #127 DuraSeal^®.  #127 DuraSeal^®, when modified with HE087 Duratuff, is more resistant to fuel, chemical, and water degradation.  HE087 Duratuff is not a viscosity builder.