You make a good point about rough pieces. I haven't seen any pics of Mike's manifold since it came out of the tank. It looked not-too-bad before it went in, so he may have a pretty good surface going.
Where he's starting from being pretty clean, the Must For Rust (Never heard of it, but there are a lot of things I haven't heard of!) sounds perfectly adequate. Any mild phosphoric acid solution will do what I'm talking about.
What I would urge him to stay away from is a product like the aerosol PermaTex Extend Rust Treatment. It's basically a clearcoat with an acid of some sort in it to convert the rust, but leaves a clearcoat in place that, depending on what one put over it for paint on a part that doesn't get hot, might make for the lifting and peeling you describe, but will definitely do it on a manifold.
Whatever name-brand product he winds up with, I think the plain acid solution of whatever strength will do what he wants (stop the rust and stabilize the surface) and leaves his options open for when he goes to finish it, whether that be plain old stoveblack or a paint that's made for the heat it will see.
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