A coating method using an amine-neutralized water-base intercoating material and an amine-neutralized water-base topcoating material, wherein the intercoating material comprises a coating composition based on (A) an amine-neutralized base resin having a hydroxyl value of 30-150 KOHmg/g and an acid value of 15-50 KOHmg/g, (B) an amino resin and (C) an amine salt of an organic sulfonic acid. This method can improve interlaminar adhesion and chipping resistance of a multilayer coating formed by the water-base coating materials.
