The only way to get rid of rust is to cut it out and weld in a patch. Above the rear window is a problem since I'm not aware of any patch panels for that area. So you may be looking at cutting patches from a parts car.
If patching is not an option, then clean out all the rust, treat the area with a rust converter like Rass O Nill, then use fiberglass to patch the area. Not a good option.
Good luck.
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