Before painting a wall why do we apply a coating of Slaked lime on it?
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Chalk is calcium carbonate. Slaked lime turns into chalk by reacting with carbon dioxide in the air over several days. This causes crystallization, which binds and strengthens the coating. Various other additives can be used....
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When used in a plaster, paint or wash, slaked lime absorbs carbon dioxide from the air as it cures, reverting back to its natural state to form a tough, permeable coating of limestone.
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