Spray it several times, if necessary, to end up with a moist but not dripping wet surface. If you apply plaster to a dripping wet area, you will dilute the plaster and that's not good either. ![]() When you put wet plaster on a dry surface, the dry part draws the water away from the joint and you don't obtain as good adhesion as when you apply it to a moist surface. We don't want it dripping, but we don't want it dry. Then, we wet the edges of the plaster as well as the wooden lathe and/or filler board with a spray of water. One of my favourite materials for this is pegboard, because the plaster can grip all those little holes. Drywall is usually too thick and we definitely want whatever material we use, to fill the hole, to be less, not equal, to the plaster wall thickness. To lessen the quantity of plaster required you should screw some kind of material onto the lathe. PARTIALLY FILL THE HOLE WITH SHEET MATERIAL The washers and the outline cut will protect the rest of the wall when you start removing the loose material. Then, with a utility knife, cut all the way down to the lathe (wood) to clearly define the edge of the patch. ![]() They will crack the paint a little, but you can touch that up when the patch is finished. Like drywall screws, you want the washers just slightly recessed from the surface of the wall so they can be covered with plaster, but they shouldn't break into the old plaster wall. The extra thin spring metal plaster washers can occasionally be found in hardware stores or at and Amazon.ca. Then, using either thin washers and drywall screws, or special 'plaster washers' with holes in them to help hold finishing plaster, secure the wall all around the area you will be cutting out. Start by using a pencil to draw a line around the entire soft area that you want to remove.Tapping on the plaster gently will give an audio indication of what is solidly attached, and what has come loose. To fix a bulge or hole in a lathe and plaster wall, we need to pay special attention to two things: limit the damage as we remove the loose plaster, and make sure the new plaster sticks solidly to the old lathe.
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