I've got a case where there are clips on the top lid that groove in to the frame to seal it up. The inside of the lid is galvanized, so that won't take paint without removal of the zinc. I don't really want to paint this, just stop the rust on those clips that are permanently attached to the inside of the case lid. I can wire brush the rust and clean it with vinegar. This will remove the zinc on the lid anywhere vinegar comes in contact during the job. Then I'd like to seal those clips, to prevent future rust. I've looked in to cold zinc sprays, but many complain that they flake off. Being internal and conductive this would be a disaster for a motherboard. I've considered applying clear enamel nail polish on the exposed areas. What suggestions do you have for sealing the exposed metal to prevent rust?

Thank you for your suggestions in advance.
TW