Abstract: The invention is a primer composition, comprising(a) a polyester resin of a carboxylic acid and a glycol;(b) a polymethylene poly(phenyl isocyanate), diphenylmethane diisocyanate or a mixture thereof; and(c) bismuth octoatein a volatile solvent.The primer composition of the invention advantageously provides improved adhesion characteristics of metal-to-glass bonding when used to prime substrate, particularly painted metal substrate before the application of a urethane adhesive. The primer composition of the invention may also be used to prime other metal and glass surfaces for use with various adhesives.