I've passed the point of no return and started to removed one of the rear fenders.
I am not in any hurry so just doing a bit at a time.
First de-waxed the seam area and then blocked out with 80 grit to exposed the filler between the panels.
I am thinking about cutting the fender off about 2-3 inches in front of the side marker light instead of removing the complete fender.
It will save a lot of work and should only require a bonding strip between the existing and new rear fender sections.
I'll see how it looks after I finish cutting the original fender out.
Its easy to see the layers of paint from my previous work. Top to bottom consists of, clear coat, blue base, grey primer, black epoxy sealer and bare glass. The pink strip is the original filler between the fender and top panel.