Abstract: A method of surface coating a synthetic plastic surface, and particularly of resurfacing an abraded polyurethane plastic surface is disclosed in which the surface is prime coated with an isocyanate-functional polyurethane in solution in an organic solvent medium which is inert to isocyanate functionality. The prime coated surface is dried by allowing the solvent to evaporate thus removing most of the organic solvent, and then the prime coating is overcoated with a water-based organic polymer coating composition. The isocyanate-functional polyurethane is desirably the reaction product of a diisocyanate with a polyether diol which may be used in admixture with a polyol containing 3 or 4 hydroxy groups. The solvent medium is desirably a blend of 75-90% of 1,1,1 trichloroethane with from 5-20% of 2-ethoxy ethanol acetate.

Abstract: A coating composition useful for plastic substrates is disclosed which comprises water having about 1-25% carboxy functional urethane polymer, about 1-25% carboxy functional acrylic copolymer, and about 1-10% aqueous alkali soluble resin dispersed therein. This composition is cross-linked by about 0.2-3% of a polyfunctional aziridine which may be added immediately before use, or prior thereto.