Feathering means gradually thinning the edges of the coating. Then feather around the affected area, so it blends with the rest of your wall. Once the second layer is dry, add the joint compound using a wallboard knife. Plus, two coats can provide a nicer-looking finish. Also, it can seal up the border to prevent unwanted drafts. The second covering can help strengthen the wall and reduce moisture leaks. Then let the layer dry for an additional day. Apply a thick coating of plaster over the hole and cross scratch. Let the first coat dry for a day and then use a spray bottle to dampen the area. A strong bond is important to keep your foundation strong and prevents future cracks. This helps create a secure bond when applying the second coat. The scratching forms shallow curves in the first coat. To ensure the second coat sticks well, cross scratch the first one as it starts to set. Consult a professional before buying supplies for repairing your wall.Īfter you apply the bonding agent, fill the hole with plaster using a wallboard knife. An acrylic latex bonding agent helps hold together the fresh concrete and the old layer. To ensure the dry plaster doesn’t absorb excess moisture, apply the latex bonding agent to the lath and plaster. When disposing of the plaster, fill a heavy-duty garage bag or bucket since the pieces can be heavy. Also, to prevent cracks from spreading, cut the plaster where you want the demolition to stop. Then use a utility knife to smooth the inside edges of the hole.īefore starting, ensure you have turned off the power to your electrical circuits. The lath is the wooden structure supporting the plaster. Make sure you are chipping lightly to prevent lath damage. Consider wearing old sneakers or construction boots to protect against fallen nails.įirst, you want to remove the affected plaster using a chisel and hammer to chip it off the wall. Also, if you are on your knees for an extended period, consider finding some old knee pads or laying down a shirt. When chipping off the plaster with a hammer, the sound could become distracting. You may also want to invest in some hearing protection, such as earplugs. To protect against breathing in unsafe air, consider wearing a sanding respirator. So wear safety glasses, a long-sleeved shirt, and work gloves for better protection. This may not be the step you often think about when determining how to patch plaster walls. Consider using a polycarbonate sheet since they are extremely durable.Īlso, excess moisture on your wall can impact the plastering process, so make sure to fix any leaks ahead of time.Īlong with getting your space ready, make sure to wear proper safety gear. Then enclose the room using plastic sheeting and painter tape. It will also make the cleaning process much easier. This will prevent spilled plaster or joint compound from staining your floors. Cover your floor with drop cloths and fasten them using painter tape. So, here is how to successfully patch plaster walls.īefore you even start, make sure you protect your space. If not repaired right away, they can lead to long-term issues. If you have plaster walls, you may begin to see cracks. Over time your walls can receive wear and tear from everyday use. When you buy through links on our site, we may earn an affiliate commission. I use all-purpose, ready-mix joint compound for the succeeding coats, and I apply these exactly the same as if I were finishing drywall.We are reader-supported. Durabond is almost unsandable, though, so I make sure to wipe the edges and overlaps clean. The advantage of using Durabond (over a traditional plaster) is that it sets up as hard as plaster but dries quickly, so if I’m in a hurry I can apply a second coat the same day. After packing the joint with compound, I cover the seam with fiberglass mesh tape, and follow up with a second layer of compound. I use a setting-type joint compound like Durabond 90 to fill the gaps, mixing up only as much as I can apply in about an hour. When all of the washers have been fastened, I vacuum the crack to remove any debris, then lightly mist the surface with water to prevent the dry plaster and lath from drawing moisture out of the patching compound before it’s had time to cure. After wiping away the excess joint compound, the crack is covered with fiberglass mesh tape, which is soon covered with a second layer of compound.
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