Often referred to as a ‘scratch’ coat, the first plaster coat creates a reasonably flat surface and is ‘scratched’ in a diamond pattern to provide a key for the next coat.įor good-quality work, a ‘floating coat’ or a ‘straightening coat’ is applied next and is worked until perfectly level. If staining continues to persist, consider ‘dry lining’ by fixing battens to the wall and applying laths and lime plaster.If you decide to replaster stained areas, when the problem is not severe it is sometimes suggested to use a slurry of cow dung painted on to the masonry before applying new lime plaster.Where staining appears through a chimney breast it may be necessary to replaster.Ensure the wall has been allowed to dry out fully before applying plaster.
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