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@bluehuw
If you're exposing any bare substrate (plaster) I'd prime it first (can use mist, bin but probably best bullseye) if it's bridging the existing work I'd give it a good course key and remove dust*. I've been using brewers premium calk, it does not like large gapes will shrink and 24+ hours semi cure, but it's very good.
*then prime for the hell of it