Henry HE087 Duratuff is 100% Acrylic Polymer chemically engineered to modify HE127 pavement sealer to achieve outstanding toughness, faster curing time, and superior UV protection. HE087 Duratuff also enhances the jet black color of HE127. HE127, when modified with HE087 Duratuff, is more resistant to fuel, chemical, and water degradation. HE087 Duratuff is not a viscosity builder.