If there are large gaps, shrinking may happen. To get started, skim the polyfill on the surface to smoothen, then use a trowel to even it out. It won’t smoothen large surfaces that have uneven walls. This method will work for small spaces or few bumpy areas. Use Polyfilla or any other alternative brand, to fill bumps and cracks. Remember to use respiratory protective gear the dust raised by this method will be everywhere around the place you’re doing it. In older homes, the plaster layer can be even thinner, and when you sand through the first layer, the underlying layer becomes bumpier. You can spend days trying to get the finish you want.Ĭonsider the type of earlier plastering that was done. Smoothening walls by sanding can be time-consuming and labour-intensive. Plaster is soft and wears off easily, be careful not to over-sand and create a bigger problem. For large bumps, select sandpaper with medium or high grit, and for smaller bumps and finishing use less coarse sandpaper. Select the sandpaper coarseness depending on the size of the bumps on the wall. If you have a large project, consider borrowing or renting an electric sander if you know how to use it or can get someone to help you with that. The condition of your existing walls will dictate the method of preparing your walls. Old brick house walls may need to be brushed down with a wire brush. Sand Existing Plaster Wallsįor bumpy and rough plaster walls, smoothen them out with sandpaper. If you have previously sanded the walls, consider washing the walls with soap and a sponge in small circular movements to get a better finish. Depending on your project, you may need a water source. Do repairs around the room and remove skirt boards or skim them for an excellent finish. Scrap off any old wallpaper on the walls and any debris. Gather the necessary materials, tools, and protective clothing you will need for the project. The first step of all should be to decide on the most suitable method for your walls.
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