Treat the exposed metal with a rust inhibitor.
How to repair rust on a truck roof.
Mask off the affected area with paint appropriate tape.
With all the rust removed the exposed metal that s left is still susceptible to rusting.
I had rust in the roof of my 1991 dodge ram.
Minor surface rust 1.
Follow the directions on the rust remover usually spraying or brushing it onto the rust and letting it sit for a few.
This is more of an encouragement than a how to.
Then enlarge the sanded area so you ll have space to feather the edges.
Rust inhibitor tends to dry quickly.
Sand through the rust spots down to bare metal.
You want a few inches of protection surrounding the rust spot.
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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.