Cathodic electrocoating

A method of coating an electrically conductive substrate which comprises

• (I) passing an electric current between an anode an a cathode in contact with water dispersed composition in which the major resinous component is an ionizable salt of an acid and the ungelled reaction product of
• (A) a polyepoxide resin derived from a dihydric phenol and an epihalohydrin, said polyepoxide resin having a 1,2-epoxide equivalent weight of about 400 to about 4000 and
• (B) a polyamine having at least 2 amine nitrogen atoms per molecule, at least 3 amine hydrogen atoms per molecule and no other groups reactive with epoxide groups;
• followed by reaction with
• (C) a monoepoxide which contains one 1,2-epoxide groups and no other groups reactive with amine groups, or a monocarboxylic acid which contains one carboxylic acid group and no other groups reactive with amine groups, said monoepoxide and monocarboxylic acid having about 8 to 24 carbon atoms per molecule,
• wherein about 1 mol of (B) is reacted with each epoxide equivalent of (A), about 2 to about 6 mols of (C) are reacted per each mol of (A) and wherein said reaction product has a weight per active nitrogen of about 200 to about 600, and
• (II) depositing a coating on the cathode.