Systems and methods for treating a metal substrate

A system for treating a metal substrate comprising:

• a conversion composition for application to a portion of a surface of the metal substrate, the conversion composition comprising a permanganate anion in an amount of 0.1 g/L to 1 g/L based on total weight of the conversion composition;
• and
• a sealing composition for application to the portion of the surface of the metal substrate following application of the conversion composition, the sealing composition comprising a trivalent chromium cation in an amount of at least 0.01 g/L and no more than 1.0 g/L based on total weight of the sealing composition and a transition metal cation in addition to the trivalent chromium cation in an amount of 0.05 g/L to 5 g/L based on total weight of the sealing composition;
• wherein the system excludes a treatment composition for application to the portion of the metal substrate following application of the conversion composition and prior to the sealing composition.