Need advice on paint repair

Hello together, recently bought a C180 used Utility briefly your advice: 1) How do I get this dark scratch on the boot lid filled and removed (you can see in only so clearly if you look directly at it from above), should only be as visible as possible again silver, not perfect, but at least that you don’t see it like that anymore. Are there paint pens, UV pens etc., what do you recommend, Link would be super 2) Well known, the model has rust here and there. It doesn’t have to be perfect either, but how do I get this removed at least visibly for a few weeks/months, is it enough spray and if so which one? Thank you already! PS: Photos included.