To improve the curability, chipping resistance, corrosion preventiveness, finished appearance (smoothness, glossiness, etc.), interlayer adhesiveness, etc., of a double coating formed by applying a cationic electropaint and an intermediate water paint by 2C1B(two coats-one bake).
A cationic electropaint containing a blocked polyisocyanate compound as a crosslinking agent is applied, an intermediate water paint containing a blocked polyisocyanate compound as a crosslinking agent is applied to the resulting coating without curing the coating to form an intermediate coating and then both the coatings are simultaneously cured by heating to form the objective double coating. A tin catalyst is contained in the cationic electropaint by ≥10 pts.wt. based on 100 pts.wt. solid resin component in such a way that the coating of the electropaint begins to crosslink and cure earlier than the intermediate coating.
KASARI AKIRA
HIRAKI TADAYOSHI
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