Patent ID: 6849338

Claim:
A coating system comprising: a) basecoat of an thermosetting asphalt extended, chemically cross linked-urethane/epoxy hybrid basecoat resting on a substrate that off-gases when coated with a thermoplastic material; and b) a thermoplastic powder coating topcoat overlying at least the base coat; c) wherein the thermosetting asphalt extended, chemically cross linked-urethane/epoxy hybrid basecoat comprises, in weight percent based on final formulation: between 10 and 90% of a petroleum asphalt; between 10 and 90% of a hydroxy-terminated homopolymer; between 0.1 and 30% of an epoxy-functional reactive diluent for reducing the viscosity of the composition; up to 5% of a surfactant for improving surface imperfections; up to 5% of an anti-oxidant; and up to 25% of a thickening agent for improved thermal resistance, resiliency, adhesion to the substrate and topcoat, and chemical resistance.