Using an angle grinder I've cut off two cast iron brackets which were
cemented into a brick wall (they were originally used to support a water
tank). I've now filled in the hole flush with the original plaster, but
almost immediately, a rust-coloured stain has appeared through the filler,
exactly in the position of the brackets. Is this stain going to continue to
appear when I paint over the filler with emulsion? Is there any kind of
treatment I should put on the filler before I paint the wall?
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