Method of coating a substrate using a thermosetting basecoat composition and a thermoplastic top coat composition

A method of forming a coating on at least a portion of a substrate by:

• a) first mixing a basecoat thermosetting composition with an isocyanate hardener to form a thermosetting mixture and storing the mixture in the absence of atmospheric moisture, the basecoat thermosetting composition comprising, 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;
• b) applying the thermosetting mixture to at least a portion of a substrate and allowing the thermosetting mixture to chemically crosslink to form a basecoat;
• and
• c) applying a topcoat thermoplastic composition onto the basecoat to a given thickness to form the coating on the portion of the substrate, the topcoat thermoplastic composition comprising, in weight percent, based on final formulation:
• between 10 and 90% of a modified ethylene terpolymer;
• between 5 and 95% of a polyethylene/methacrylic acid copolymer;
• between 5 and 95% of a polyethylene/methacrylic acid ester copolymer ionomer;
• up to 50% of a coloring pigment;
• up to 5% of an anti-oxidant;
• up to 5% of an ultraviolet stabilizer;
• up to 5% of a surfactant for improving surface imperfections;
• and
• up to 25% of a thickening agent.