Nolen did you try Penetrol to coat the rusted metal?I’m really over the Boiled Linseed Oil to treat rusted metal. Fluid Film soaks in so much better.
I’m working on a project that’s mostly patina paint but has bare steel on the tops of the roof and fenders, reading everything I can to see if there is a product that might last a few years on both steel and paint between touch up.
Have you looked into Ever Bright Coating? I’ve read that some guys are having good luck using it over the paint and steel but I can’t find any real world long-term reports. Restore Metal and Keep Metal Looking Its Best