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wrote:
Are any of so-called rust neutralizers effective at keeping rust at
bay? Paint and hardware stores have suggested trying Rust Destroyer
or Ospho to neutralize the rust. Another suggested Hammerite paint
which is self-priming.

I'm going to be painting an aluminum (or steel?) post that separates
two aluminum framed windows at the corner of the house. I've scraped
off all the old paint and cleaned out the caulk between the windows
and frames. The post (beam?) has what I think is just surface rust on
the inside but more advanced rust in one spot outside where the
outside concrete/stucco sill meets the post. Will any of these
provide lasting results or are there others that are better? Oh one
more thing, what should be used to clean the post off before applying
whatever I end up using?

Thanks.

I've used rust "neutralizers" on outdoor furniture a couple of times,
with poor results. Best is to grind, wire-brush or sand loose rust,
then use a rusty metal primer, like Rustoleum. Concrete always holds
moisture, so it will probably cause more rust if it remains in contact.
Different metals should be isolated from each other, I
believe...plastic? When dealing with iron, it should be clear of loose
rust and then primed right away to prevent more rusting from starting -
clean with denatured alcohol to remove oils and fingerprints.