As you have mentioned, I use the boiled linseed oil. It's at Home Depot. Put it on a rag, and wipe it on over the rust and old paint. The finished look is sort of wet, just a little darker than without it, but it will pretty much freeze the look as is. I love it. I use it on my bare metal frames so they won't rust.
How often do you have to re-apply the oil, or do you bother?
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