A binder composition for preparing an air drying lacquer, comprising a binder in combination with an organoaluminum compound, the binder being an ester reaction product of an unsaturated, monobasic, aliphatic carboxylic acid having 16-24 carbon atoms or a mixture thereof, optionally with other acids, and a polyhydric alcohol having 6-8 hydroxyl groups. The invention also refers to an air drying lacquer free from solvents comprising said binder composition, siccative, and optionally pigments and other conventional additives.
