The rust should be gone but.
How to repair rust on a truck roof.
Rust inhibitor tends to dry quickly.
Mask off the affected area with paint appropriate tape.
Complete the feathering with 220 grit.
Minor surface rust 1.
Sand through the rust spots down to bare metal.
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Follow the directions on the rust remover usually spraying or brushing it onto the rust and letting it sit for a few.
Treat the exposed metal with a rust inhibitor.
This is more of an encouragement than a how to.
You want a few inches of protection surrounding the rust spot.
Switch to 120 grit sandpaper to feather the edges of the repair area.
This is a quick summary of how i repaired it by replacing the roof.
Spray the entire area liberally with the rust inhibitor to stop the spread of any new rust before moving on.