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I'm attempting this at the moment (when it's above 5 degrees). The plan is lime putty for smaller areas and lime putty/sand mortar mix built up in layers for larger areas. Then a final wipe down before final lime plaster layer, then lime primer, then breathable paint.
Getting the mix, moisture level, temperature and ensuring you're patient seems to be what others recommend. YouTube videos look easy enough, etc.
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The old house store is a pretty good starting point. They sell pre-mixed lime mortars and plaster which is much better than mixing it yourself. Their sales team are knowledgeable and helpful too.
I use them all the time for heritage work.
Has anyone repaired a large defect in a lime plastered wall?
It's likely we'll have to remove a football sized section of plaster to get to the brickwork behind it. It's probably lime based.
Anyone on here know the correct process / materials for repairing the plaster and redecorating the area? It's likely the area has a wallpaper on it too.