The invention provides a photodegradation resistant curable
electrodepositable coating composition which includes one or more
ungelled, active hydrogen-containing cationic sulfonium salt
group-containing resins which are electrodepositable on a cathode, and one
or more curing agents having cationic groups or groups which are capable
of forming cationic groups. The invention also provides processes for
coating an electroconductive substrate with the coating composition, to
form single layer or multi-layer composite coatings. Also provided is a
multi-layer composite coating in which the electrodepositable coating
composition is used to form the primer layer. The compositions have
improved throw power versus typical sulfonium salt electrodepositable
compositions.
