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I agree use a 2 part epoxy , I'd de-rust it best you can anyway and use a rust inhuibitor first then wash then paint.
if metal is bolted to other metal and it doesnt; show I use undercoat or a tar like substance so when you draw the bolts up it can oooze out leaving no gap for capillary action or rust to start up in. cleanup any oooze out with paint thinner. there are likely other things that will work, butyl tape for window sealing, for example. or a tube of butyl sealing compound. if you are thrify maybe try roof patch stuff.. if you need to paint over it you need a paintable goop or similar. I'd just look and see whats on the shelf. RTV or gasket goop, then ok.
some might like por 15 but check if por i5 is ok to paint over, Im not sure on that.
you can always paint over and use guards red after epoxy.. if you have some good epoxy primer around, in any colour.
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