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Ensure ceilings are clean, stable, and free from movement before plastering. Avoid applying plaster too thickly, and allow each coat to firm before applying the next. Maintain consistent drying conditions to prevent shrinkage cracks.
Plastering should only be carried out in temperatures above 5°C and in dry, well-ventilated conditions. Cold or damp environments can delay setting, weaken adhesion, and lead to poor surface quality.