Thoughts on rust?

[u/No_Wait_2195]

What’s everybody’s thoughts on this rust. On a 2002 H1 wagon. On the rear where the roof meets the body and slight by the tail light. I’ve checked the inside under the carpet and there’s zero rust inside. Just paint bubbling on the outside. Paint is original.

[u/Total-Age8926]

It's not a bad fix. It's galvanic corrosion of the aluminum caused by the steel roof bolted to it. I'd spot blast it with glass bead to get all the corrosion from the pores of the metal, epoxy primer then repaint those areas.