PURPOSE: The titled composition that contains a mixture of an acid-modified cyclopentadiene resin and a naturally occurring and processed oil as the vehicle, thus showing high weather resistance, drying properties, water resistance and corrosion resistance.

CONSTITUTION: For example, (A) 15W85wt% of a processed product of naturally occurring oil is mixed with (B) 85W15wt% of an acid-modified cyclopentadiene resin of 0.5W40, preferably 3W30 acid value and 60W150°C, preferably 80W140°C softening point, which is obtained by adding (i) an unsaturated carboxylic acid such as maleic anhydride to (ii) cyclopentadiene monomer and (iii) a nonpolar vinyl monomer such as conjugate diolefin, to give the objective composition.

EFFECT: Pigments such as titanium white, pigment dispersant, drying agent and other additives for paint are added to the composition to give an enamel.