Process for coating thermoplastic substrates with a coating composition containing a non-aggressive solvent

A process for coating a colored thermoplastic substrate having a surface with splay marks and surface blushing which comprises applying a solvent based coating composition to the substrate and curing the coating composition at ambient temperature to 125° C. to form a uniform smooth film of a degree sufficient to hide underlying said splay marks and surface blushing on the substrate;

• wherein the coating composition comprises about 45-80% by weight of a film forming binder and 20-55% by weight of an organic liquid carrier;
• wherein the binder consists essentially of
• (A) 40-90% by weight, based on the weight of the binder, of a chlorinated polyolefin-free polymer selected from the group consisting of acrylic polyol, polyester polyol, polyether polyol or a polyurethane polyol;
• and
• (B) 10-60% by weight, based on the weight of the binder, of an organic polyisocyanate crosslinking agent;
• and
• wherein the organic liquid carrier used in the coating composition consists of at least 50% by weight, based on the weight of the organic liquid carrier used in the coating composition, of tertiary butyl acetate and up to 50% by weight, based on the weight of the organic liquid carrier, of other compatible organic solvent.