Switch to 120 grit sandpaper to feather the edges of the repair area.
How to repair rust on a truck roof.
You want a few inches of protection surrounding the rust spot.
Spray the entire area liberally with the rust inhibitor to stop the spread of any new rust before moving on.
Complete the feathering with 220 grit.
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Minor surface rust 1.
Mask off the affected area with paint appropriate tape.
This is a quick summary of how i repaired it by replacing the roof.
With all the rust removed the exposed metal that s left is still susceptible to rusting.
Treat the exposed metal with a rust inhibitor.
I had rust in the roof of my 1991 dodge ram.
The rust should be gone but.
Then enlarge the sanded area so you ll have space to feather the edges.
This is more of an encouragement than a how to.