Always add the plaster mix to the water, not the other way around.Then, use a plunger or stirring rod to begin incorporating the dry plaster particles. Open a new bag of plaster mix and shake it into the bucket until it forms a mound above the surface of the water. Fill the bucket to the halfway mark with cool, clean water. Mix your plaster in a 5 or 7 gallon (18.9 or 26.5 L) (19-26L) bucket. Also a wall that is too dry causes the water to be absorbed out of the plaster and set before it has time to stick to the wall. Dust, soap, oil, tar and mold all cause the plaster not to adhere to the surface. You should always begin by cleaning your work surface, whether you’re resurfacing an old wall or plastering over brand new lath.Spraying the wall with water will help the new plaster to adhere to the old wall. If it comes away caked with dust, it still needs some work. To test whether the wall is ready to accept new plaster, run your finger over the surface.Otherwise, there may be bumps and indentations on the finished wall. Make sure the wall and ceilings are plumb and flush before you start plastering. ![]() Repair any cracks in the wall before plastering it.Prime over stained areas to ensure the plaster will adhere properly. ![]() When you’re done, wipe the wall with a damp cloth to pick up what you loosened with the brush. Pay particular attention to the areas with heavy buildup, or where stripped layers of old plaster have left behind clumps. Scrub the wall from top to bottom with a dry stiff-bristled brush. Clean the wall to remove dust and debris.
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