Ignore it. If your salt exposure is bad enough for that to be problematic in 7 years then your rear quarters, exhaust and suspension are all going to be a dramatic mess.
like he said that’s labor intensive to get it right and it’s going to be madly susceptible to problems. Rusting anyway, clear coat peeling, poorly done paint issues, not matching, blending...
Bare minimum grind/sand each spot, clean and prep and hit it with a bottle of Subaru touch up paint
more specifically if it needs to look nice, sand all the rust off, treat with POR15, clean, prep the areas for painting and prime, paint, clear coat it all while doing your best to blend each area or one large area. At which point - sand paper, POR15, primer, paint, clear and tools you don’t have - it may be easier and cheaper to just strip it all and start from scratch depending how big the area is. That’s what a shop would do. They wouldn’t typically address all those little dings.
don’t get me wrong it Can be done if you’re high on time and wherewithal. but if you’re asking that probably means you’re not a paint guy and that’s something that’s as much art than science and requires a skill set that isn’t easily got from reading. I avoid it at all costs because I’m bad at it and it’s not my skill set. it’s way harder than dropping engines and trans and tearing them apart. Compared to body work and paint, that stuff is easy: “this bolt goes in this whole - wash-rinse-repeat”.Painting is not that simple and automotive prime/paint/clear finishes are more akin to chemistry than you’re average latex house paint. People too often equate painting a car with painting a house and that’s not in the same ball park. again - it can be done but start googling, you won’t learn it all in one thread.
after all that Work, like lmdew said, it would be cheaper or the same cost, and take 10 hours less time to just buy a used color matched hood.
there generally aren’t many short cuts to body, paint and rust work.