A liquid coating composition, having good curabilitynand good storage stability, and which provides a cured filmnhaving good weather resistance and, particularly, acidnresistance, comprises: (a) a compound having at least 2ncarboxyl groups; (b) a compound having at least 2 epoxyngroups; and (c) 0.01 to 3.0 parts by weight based on 100nparts by weight of the total resin solid of an onium salt.