How to Patch Plaster Walls


There are several ways to patch plaster walls. You can use wood putty or joint compound, or you can use a Nu-Wal method. This method involves cutting the patch in a rectangular or square shape and making the edges undercut. This will create a neat joint. Then, you can paint over the plaster.

Nu-Wal method

Applying the Nu-Wal method for patching plaster can make the entire repair process faster and easier. First, you must ensure the plaster surface is dry and clean. Then, apply a coat of penetrating surface conditioner. Then, use a second coat of lightweight spackle to level the patch. Let the plaster cure for 24 to 48 hours before patching.

The Nu-Wal method is a great DIY home improvement project, and the materials are inexpensive. You can usually finish the project for less than $100. This method is also reusable so that you can keep it for future repairs. This method will save you much money compared to hiring a professional to repair plaster walls.

If you’ve previously repaired the plaster walls, you should be able to do the patching process yourself. However, before you begin, you should make sure that you are using quality materials. You can buy pre-cut wood products for this purpose. Another option is to cut custom wood shims on a table saw.

Using joint compound

If your plaster walls have holes, you can patch them with a joint compound. You should use a reinforcing mesh, typically aluminum, to help the compound adhere to the wall. This will prevent the joint compound from drying out and crumbling. After the patching compound is dry, you can sand it and paint it to match the existing color of the wall.

To apply joint compound, use a wallboard knife 10 inches wide. Use a feathered edge to apply a thin layer. After applying the first coat, sand it smoothly with a fine-grit sandpaper. If the patch is large enough, you can apply a second layer of joint compound, but make it thin so that it blends in with the surrounding walls. After applying the final layer, let the patch dry for at least 24 hours before painting it.

Plaster walls are often riddled with a network of hairline cracks. These cracks are too small to be addressed with patching plaster. In these cases, skim-coating is an effective option. The technique involves applying thin layers of joint compound to the wall to restore its surface. These layers are typically less than an eighth of an inch thick. The compound smoothes a rough surface and prevents a new one from developing.

Using wood putty

If you need to repair a hole in the plaster, you can use wood putty to fill the hole. After it dries completely, you can apply paint to the patch. You can add baking soda to the mix if you need a thicker consistency. Another alternative to wood putty is spackle. To apply this compound, use your index finger to push it into the hole. After you’ve applied it, you can smooth the edges with a wet finger.

This type of filler can be used to cover nail holes and other damage to wood surfaces. It can also hide scratches and nicks. For minor repairs, you can try Guardsman Wood Repair Filler Sticks, specifically designed for this purpose. These sticks can fill minor dents and other small holes in furniture. You can also use these sticks to fill exterior woodwork, such as decking boards. These fillers bond with the wood, so you won’t have to worry about them spreading outwards when you paint them.

Before applying wood putty to patch plaster walls, you should sand the existing plaster. The original lath must be secure because the weight of the patching plaster could make it lose. Also, ensure that the patch is not too flat or will stand out from the rest of the wall.

Painting over plaster

When painting over plaster walls, it is essential to use the correct type of paint. A latex formula is best, and it should have a satin finish. While patching over damaged plaster may seem adequate initially, quality paint will last longer. Apply primer before painting, and let it dry. Once the primer has dried, it is time to paint the walls.

Using an all-in-one paint and primer blends the paint better and makes it last longer. However, it won’t solve the problems of using primer on old plaster walls, which means decades of stains may have already seeped through. The final step is to apply a decorative coat of paint.

When painting over plaster walls, it is essential to clean the wall thoroughly to ensure that the paint adheres. A damp cloth should be used to wipe off any dust. After wiping the wall, allow it to dry completely. The painting process begins with a small test area, using wide, even strokes.