PURPOSE: To obtain a coating compsn. curable at ambient temp. by making the composition contain an unsaturated condensation polymer having a specified structure, a compd. containing a specified amino group and specified cyclic ketone.

CONSTITUTION: The composition is obtained by contain a condensation polymer having a polymer main chain represented by formula I (wherein R and R7 are H, a halogen, alkyl or aryl) and containing one or more activated unsaturated group on an average (pref. mainly derived from a reaction product of maleic anhydride, bisphenol A and propylene oxide) (A), a compd, containing three or more latent blocked primary amino groups (pref. adduct of a reaction product of diethylenetriamine and methyl isobutyl ketone and polyisocyanate) (B) and a cyclic ketone represented by formula II (wherein the sum total of m, n and p is 2-5 and R1-R6 are each H or a 1-6C alkyl) (pref. example: cyclohexane) (C).