• For a DIY job you don't need to take all the original paint off, just local prep. on rust, scratches and chips and key the whole lot before priming. If you're removing someone else's handywork, then maybe, depending on the type of paint they used. An isolater coat primer can work in this case, to prevent dissimilar paints reacting badly.

    Screwfix do a brilliant zinc spray primer for less than a fiver. One can does the job.

    If you do want to strip all the paint, use any means you prefer- usually works out as a combination of methods. It's the nooks and crannies that take time, whatever.
    Or get it caustic dipped, if it's steel.

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