You want a few inches of protection surrounding the rust spot.
How to repair rust on a truck roof.
This is a quick summary of how i repaired it by replacing the roof.
Sand through the rust spots down to bare metal.
Switch to 120 grit sandpaper to feather the edges of the repair area.
Follow the directions on the rust remover usually spraying or brushing it onto the rust and letting it sit for a few.
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I had rust in the roof of my 1991 dodge ram.
Minor surface rust 1.
This is more of an encouragement than a how to.
Rust inhibitor tends to dry quickly.
Treat the exposed metal with a rust inhibitor.
The rust should be gone but.
Then enlarge the sanded area so you ll have space to feather the edges.
Spray the entire area liberally with the rust inhibitor to stop the spread of any new rust before moving on.