If you know the thickness of the new plaster , the drying time is 24hours per 1mm thickness. Do not dilute the first coat , it messes with the design of the formula and will result in paint failure later, get a product called plaster primer as your first coat .
Hello Ivor, you will need to wait until the plaster has turned pink throughout, and the ratio for thinning the paint is 5 parts paint to 1 part water. Good luck, Ian
Just tip a cupful of water into an average size tin of paint G. Branch plastering
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