saabfast wrote:It will be interesting to see it cleaned up with a nice viscous knotted wire brush.
I'd attack that metal with the pointy end of a panel beating hammer instead, even where it looks sound as it could be wafer thin underneath. That's what I did to mine on both sides. A few blistering paint spots were just the tip of the iceberg.
I bought one of these for the left and right side https://rimmerbros.com/Item--i-RB7670
and I also hand fabricated strips to replace the bottom 2" of the rear bulkhead and several large patches of the rear floor panel and its trailing edge. Lots of butt welding, not joggled welding for water proof joints, and plug welding where the bulkhead meets the floor. Afterwards lots of zinc rich paint followed by chassis paint then underseal to protect the factory crafted rot traps. My welding wasn't pretty but it was strong and that area's still good 25 years later dealing with the torque of a V8.
There's a short thick U shaped metal strap that's welded underneath each radius arm mount in the factory. After removing them to repair the floor, I made sure I welded them back on to cope with V8 power.
It was my converting to V8 that prompted the bulkhead cracking. I was accelerating hard up a steep local hill shortly afterwards and experienced a pronounced rear end wiggle. Jacking up the rear revealed large horizontal cracks in the rear bulkhead where the metal had thinned. Removing the seats and carpets to effect a repair revealed blisters similar to KSTRUTT sphoto, cutting out the rot completely revealed holes similar to JEREMYJ s.