So if anyone plans to take on some paint stripping/rust removal @83ChevyK5Blazer i would highly recommend picking up one of these.
https://www.eastwood.com/4-1-2in-cleaning-stripping-disc-system.html
The black disc makes easy work of paint and primer, rust takes a little more time but it’ll get it.
I probably just had cheap sandpaper but I went through about 3 sheets of 80 grit on the DA and probably didn’t even get a 1/3 of the roof done.
Benchmark abrasives has a better stripping disk then that. And yes they work extremely well.

