Need some advice on a rust repair

[kwin]

I completely gutted the interior on my 1991 suburban today, and I'm happy the truck was sold to me as rust free and it's as close as I have ever seen for a 21 year old vehicle.
The only rust is the inner rocker body seam , and the wheel well where the spare tire goes.
The rocker is not an issue I'll cut it out and have a buddy tig in new pieces , but the one in the wheel well is in a seam where two panels overlap.
It's not rotted through but it's definitely coroding , the entire rust area is about 2-3 inches long. Any suggestions on how to deal with this before it goes too far?
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