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How to I prepare brick, block or stone walls for Limelite plasters?
All traces of Gypsum should be removed from the substrate before plastering commences. Gypsum plasters are hydroscopic and absorb moisture. Over time this moisture causes the gypsum to disintegrate and hollow spots will appear in the wall where plaster has deteriorated. If the substrate is of a loose, friable nature this needs to be stabilised before plastering is carried out.