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I had the same thing on my 00 Tahoe. I scrapped/sanded away any loose rust, sprayed it with rust converter and painted it. I did this about a month ago and the rust is already coming through again.
agreed 07burb im having a por15 date with my ride realll soon
Which is why you gotta get the rust completely out cuz it'll come back again from behind. POR15 is the only product I know of that'll actually stop rust on the spot but it's possible that there are other products that'll do the same thing.