How do I repair a steel garage door that is starting to rust?

I have 3 garage doors. One is a double door and the other 2 are single doors. Each door is made of steel and has an automatic door opener. Where the panels align on the doors, small pits of rust are appearing. The doors are white and this is beginning to show up. I have contacted the manufacturer and no response as to how to repair or stop the rust from appearing. Help on how to fix this situation before it becomes a major issue on the doors.

  3 answers