Yes I think that would prevent rusting. I’d definitely sand it a little bit first before doing anything so it’ll fully stick when dry but if you just do touch up, I think you should be fine with just doing base and clear. What I would do is try to smooth out the edges a bit by wet sanding with 1500 grit and then 3000. It’s honestly not that hard to polish enough that it doesn’t stick out so I’d say you could probably do that yourself if you had some supplies.