Patent ID: 6881313

Claim:
A method for inhibiting a crater from occurring in a coated film at the time when a coated film is formed, which comprises cathodically conducting electrodeposition coating on an object to be coated; and baking the electrodeposition coated film, wherein the electrodeposition coating is conducted with a cationic electrodeposition coating composition which contains the following aminopolyether modified epoxy having polyether chain, as an additive: the aminopolyether modified epoxy having a number average molecular weight of 20,000 to 100,000, obtained by allowing an aminopolyether having polyalkylene oxide chain and two primary amino groups or secondary amino groups and having a number average molecular weight of 150 to 3000 to react with a diepoxide having two epoxy groups and having a number average molecular weight of 300 to 7000 in such amounts that the primary amino groups or the secondary amino groups of the aminopolyether based on the epoxy groups of the diepoxide is 1.05 to 1.8 in equivalent ratio.