I read about the electrolysis method
several years ago.
The fellows were removing rust from old gas pumps and similar collectibles.
I came away with a negative impression, and that it was quite dangerous.
However, if members here have any war stories, I'd be anxious to hear. - :up
The wire wheel method need only remove loose rust.
There is no need to try to get it all off.
The primer forms a chemical bond with the remaining bits, providing a strong under-layer for paint.
primer -
Rust Destroyer - over which you might use any top coat.
paint -
Hammerite - primer and top coat in one.
I don't have 20 years history with these paints and primers, but I did buy into their hype.
We'll see if they outlive me. -