VHT Paint

CRUZE 418 said

Also, if you don't coat them, headers rust from the inside out. Can you say moisture, daly driver. It's the moisture from inside, just like the exh pipes and mufflers that will kill them. Paint just keeps them looking nice on the outside.

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It's actually the moisture mixing with the soot that creates an acid that destroys most any exhaust sytem. That's why it's never good to periodically run a motor to just charge the battery or circulate the oil unless it's to bring the motor completely up to operating temperature for a sustained time where it will remove moisture from the motor oil as well. Hot and cold cycling creates moisture.