jwyfk- Before I forget it again...note that many Rust Converters don`t *really* leave a "nicely primed surface that any paint will stick to". They say that, but it doesn`t always work out that way (again, not slamming any particular product).
I`d *absolutely* get underneath and spray some Eastwood stuff under there to keep it from coming back even worse (as in, rust-out). Can`t say whether I`d use their BHDAR or their Frame Coater stuff, but I`d sure do *something* from that side after addressing the top part.
I`d also do the same to the gaps around the plates, which I`m guessing don`t show.
I`d be all about not letting this "minor surface rust" turn into a complete weld-in-new-steel rust problem.
So...[repeat previous product recommendations and] give some more thought to whether you could live with some satin-black sealer (the BHDAR) if it`s a choice between that and ongoing rust concerns. The way that bearing plate (thanks, EXPDetailing...the term was eluding me) is always gonna move about a little makes me think that just painting it won`t work any better for you than it did for the factory`s work.
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