I have been told/taught by more than one pro, that paint doesn’t stick to anything better than old paint… So to prep this rear frame, rather than stripping the paint entirely off, I sanded down the existing coat slightly with some 400 grit sandpaper to get a nice grippy surface for the new paint to stick to. Some of the rougher sections were smoothed with a file, then the rest was done with lots of wet and dry sand paper. Once I was satisfied with the prep, I sprayed on a coat of rust preventing primer. Now it is ready for some filler primer, a bit of sanding, then some final coats in satin black :)