Join Date: Apr 2006
Thanked 183 Times in 180 Posts
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Crazing and pox and glecoat aside...It sure LOOKS like the patchwork quilt of previous repairs and coatings. If what you have is solid (not gooey, no loose) and looks stable, I'd say to clean it, prep it, apply a couple or three layers of barrier coat and then the topcoats of your choice.
You could also try emailing maximum-detail pictures to a couple of the companies that make epoxies and barrier coats and blister repairs, asking them if any of the colors or work seem familiar to them. (WTF, they won't charge you for it.)