Rusty inner door

[mrvids]

This is inside of the door on my daughter's car. What can I do to prevent it from getting worse?

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[RSpencer]

Wire wheel, self etch primer, hit it with paint

Or scrape off what you can and hit with some chassis saver/POR 15.

 

[mustangjoe87]

No matter what you do being that its on the seam it will eventually get to the outside.

 

[Beigg]

if it's a factory paint color, buy a better conditioned door of the same color to be its replacement when the time come.

 

[1BADAIR]

Used engine oil

 

[Time2Kill]

Used engine oil

I usually squirt some engine oil inside the door to keep the inside of the seam wet with oil.