When preparing a second-hand house for wallpaper, the walls need to be properly treated before applying the wallpaper base film. Ideally, the wall surface should be flat, dry, and evenly colored. For cement or brick walls, which are generally smooth, you can apply putty to level the surface and then add a thin coat of varnish before proceeding with the wallpaper. However, if the walls are made of gypsum board, plywood, or blockboard, it’s important to first seal the seams. This can be done by mixing white glue with water (such as vinyl acetate resin) and then combining it with plaster to ensure the joints are strong and won’t crack over time. When mixing the putty, adding a small amount of white glue will make it easier to sand later. There are two common types of walls: powder walls and smooth walls. A powder wall has a weak, flaky surface that needs to be sanded down, leveled, and then coated with a base film before wallpapering. On the other hand, a smooth wall is very slick and doesn’t absorb adhesive well, making it difficult for the wallpaper to stick. These walls tend to remain damp for longer periods, which can cause the wallpaper to peel off over time. Therefore, it's essential to sand them before applying any wallpaper. The base film serves an important purpose in the process. It helps cure and protect the putty layer while also enhancing the wall’s waterproof and anti-mold properties. However, it’s crucial to wait until the putty is fully dry before applying the base film. The base film is a fast-drying product that acts as a substitute for traditional varnishes. Similarly, the varnish and sealer help protect the putty surface and improve its resistance to moisture, mildew, and alkali. These coatings should only be applied after the putty has completely dried. In addition to these steps, when working on a second-hand house, it’s important to remember that no wallpaper should be installed by soaking it in water. Before starting the wallpapering process, the walls should be thoroughly brushed to remove any dust or loose particles. This ensures better adhesion and a more durable finish. Inner Support Fabric Air Duct,Air Duct Material,Fabric Air Duct,Air Conditioning System Jiangsu Buna Technology Development Co. , Ltd. , https://www.bunaduct.com