| 摘要 |
The present invention provides a method for forming a multi-layer paint film, comprising:applying a cationic electrodeposition paint containing a block polyisocyanate compound as a cross-linking agent on a surface of a painted matter,applying a water based intermediate coat paint containing a block polyisocyanate compound as a cross-linking agent on an electrodeposition paint film surface without curing the electrodeposition paint film to form an intermediate coat paint film, and thenheating to cure both of the electrodeposition paint film and the intermediate coat paint film at the same time to thereby form a multi-layer paint film,wherein the above cationic electrodeposition paint contains a tin base catalyst of at lest 10 parts by weight per 100 parts by weight of the resin solid matter, and a cross-linking curing reaction in the electrodeposition paint film is controlled so that it starts earlier than a cross-linking curing reaction in the intermediate coat paint film.
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