I'm going to use grinder with wire attachment just wondered about using a primer on the steel before top coat, something like red oxidePersonally I'd spend some time with a wire brush (or drill/anglegrinder) to remove as much loose stuff as possible, then use hammerite - if that is the look you are after
There's some stuff called POR15 or similar which people swear by and use on classic car suspension components etc. Hammerite tends to be a bit brittle and can flake off.
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