Coating composition of hydroxy functional acrylic polymer, polyol and polyisocyanate crosslinking agent

A clear coating composition having a film forming binder solids content of about 30-70% by weight and organic solvent,wherein the binder contains

• (A) 50-80% by weight, based on the weight of the binder, of a hydroxy functional acrylic polymer consisting essentially of polymerized monomers of styrene, an alkyl methacrylate having 1-4 carbon atoms in the alkyl group, a hydroxy alkyl methacrylate or hydroxy alkyl acrylate each having 1-4 carbon atoms in the alkyl group, an ethylenically unsaturated carboxylic acid reacted with a glycidyl ester of carboxylic acid;
• wherein the acrylic polymer has a number average molecular weight of about 1,000-12,000 determined by gel permeation chromatography;
• (B) 1-20% by weight, based on the weight of the binder, of a polyol component having the formula of ##STR5## wherein:
• R.sup.1 is a covalent bond or alkylene group containing 1, 2, 3 or 4 carbon atoms;
• n is 1to 4;
• m is 2, 3 or 4;
• and
• Q is a saturated carbocyclic ring containing 5 or 6 carbon atoms, or S--R.sup.2 --T wherein S and T are each independently saturated carbocyclic rings containing 5 or 6 carbon atoms, and R.sup.2 is a covalent bond or an alkylene group containing 1, 2 or 3 carbon atoms;
• provided that no more than one R.sup.1 is bound to any carbocyclic carbon atom, and further provided that when Q is S--R.sup.2 --T, each R.sup.1 is bound to a carbon atom of the carbocyclic rings of S and T and
• (C) 10-49% by weight, based on the weight of the binder, of an organic polyisocyanate.