Process for electrodepositing cationic compositions

In a method of electrocoating an electrically-conductive surface serving as a cathode which comprises passing electric current between said cathode and an anode in contact with an aqueous electrodepositable composition,

• the improvement wherein said electrodepositable composition comprises:
• A. a hydroxyl-containing adduct which is the reaction product of a primary or secondary amine and a polyepoxide, said adduct being solubilized with acid to provide cationic groups in said adduct,
• B. a blocked organic polyisocyanate stable at room temperature in the presence of hydroxyl or amino groups but reactive with hydroxyl or amino groups at elevated temperatures.