Prep Work

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Any existing wallpaper should be stripped, and walls need to be smoothed out. If there are cracks and holes, fill and sand them. If the walls are really rough, skim coating is suggested. 

Walls should be primed in advance, either in white or tinted with the same color of the desired Venetian plaster. Clear the room and put down a dropcloth to prevent damage to the floor. Wear eye goggles and gloves.