The present disclosure is directed to a method of replenishing or treating an electrodepositable coating composition comprising an at least partially solubilized bismuth catalyst, the method comprising adding a cerium salt, a lanthanum salt, a zinc salt, an acid scavenger, or any combination thereof, to the electrodepositable coating composition. Also disclosed are methods for making electrodepositable coating compositions, systems for coating a metal substrate, and coated substrates.

The invention provides an electrodepositable coating composition comprising a resinous phase dispersed in an aqueous medium, said resinous phase comprising: (1) an ungelled active hydrogen-containing, cationic salt group-containing resin; (2) an at least partially blocked polyisocyanate curing agent; and (3) a pigment component, wherein the pigment component comprises an inorganic, platelike pigment present in the resinous phase, wherein the electrodepositable coating composition contains less than 8 percent by weight of a grind vehicle, based on the total weight of solids in the electrodepositable coating composition. The invention also provides methods of improving the corrosion resistance of a metal substrate and coated substrates.