Catalyzing cationic resin and blocked polyisocyanate with bismuth carboxylate

The present invention is directed to a method of catalyzing the process for de-blocking blocked isocyanates to form crosslinked coatings. More particularly, the present invention relates to the use of certain bismuth carboxylates that are effective in catalyzing both a solvent borne and a waterborne process to form such crosslinked coatings. A method of catalyzing a cationic coating comprising a cationic resin such as an epoxy resin-amine reaction product or a copolymer of a cationic monomer, and a blocked polyisocyanate, wherein a catalyst is added, said catalyst selected from the group consisting of bismuth carboxylate(s) having a hydrocarbon chain of from 11 to 36 carbon atoms and a molecular weight of from 165-465, and a mixture of a bismuth salt selected from the group consisting of bismuth oxide and bismuth chloride, and a carboxylic acid having a hydrocarbon chain of from 11 to 36 carbon atoms and a molecular weight of from 165-465.