The nonaqueous medium used in the composition is a blend of (1) an organic aliphatic solvent which at 25??? C. is a nonsolvent for Polymer A and remains a nonsolvent at elevated temperatures for Polymer A and is a solvent for Copolymer B at 25??? C. and (2) a coalescing solvent which at 50??? C. and above is a solvent for the binder and form a high quality finish.