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These are the kind of products you will need:
https://fosroc.com/product/show/galvafroid
https://fosroc.com/product/show/renderoc-patchI've no idea if Fosroc's distribuotrs are 'pro-sumer' friendly at the moment,
but,
as the Economy is in a hole they may well be more amenable.This kind of stuff looks pricy,
but,
replacing the concrete fence posts is a tough job,
(about a year ago a price of £90 per post was quoted on here for London),
and if you are doing it yourself it would be easier to cut the existing posts
flush with their concrete surrounds,
and,
start with a half panel,
and dig new holes,
or you'll be getting through 2 or 3 bags of Post-mix per re-used hole.Note; Renderoc or its equivalent works best onto roughened concrete to give it a key,
so no running an angle grinder along the spalled concrete to give a wonderfully smooth edge.
@mespilus, I thought as much. I'm Intending to stay here however not sure I'm up replacing them at the moment. Is it worth de-rusting, painting and the filling? Cheers