Yes, the good thing about my GK is that the beat up portion is completely removable, so no worries about spraying unwanted areas. I would probably do a chemical strip with a wire wool rub down to key the surface. The original paint seems quite thick so an overspray might show the lumps and bumps. I’m thinking a metal primer followed by several thin layers of a satin hammerite spray? I realise I may not need a primer, but the truth is, I love doing little jobs like this as I get a real sense of satisfaction, so I like to drag it out