Before pasting the wallpaper, the wall surface must be clean, smooth, and free of irregularities. Any cracks or uneven areas should be removed using a blade, then filled with putty. After drying, sand the surface to ensure it’s even. For large areas, it's best to use old powder mixed with cooked rubber powder to strengthen the wall. For small gaps, mix gypsum powder with some oil to create a suitable filler. It's also advisable to apply two coats of varnish to protect the wall and prevent moisture. Once dry, gently sand the surface again. Avoid applying too much oil, as this can make the wall too smooth, leading to poor adhesion and potential seams when the wallpaper dries.

The main steps for applying wallpaper on a plasterboard surface include: cleaning the wall, filling gaps, sanding, sealing seams, applying joint compound, sanding again, brushing the base glue, marking lines, applying adhesive, pasting the wallpaper, aligning the seams, pressing out air bubbles, wiping excess glue, and trimming any excess.

Before pasting the wallpaper, proper wall preparation is essential. The wall should be smooth, dry, crack-free, solid, and free of dust. For cement brick walls that are already flat, you can use putty to level the surface, then apply a thin coat of varnish before pasting the wallpaper. For gypsum board surfaces, which often have seams, fill them first before applying the putty.

Applying a sealant or primer serves to cure and protect the putty layer while enhancing the anti-alkali properties of the wallpaper. This step should be done only after the putty is completely dry. Wall treatment for wallpaper is similar to painting, so a painted wall can be converted into a wallpapered one, but it needs to be sanded first.

According to the national standard for the acceptance of quality in building decoration engineering (GB50210-2001), the base surface must meet certain requirements before applying wallpaper. First, any loose old decorations on an existing wall should be removed, and an interface agent should be applied. New concrete or plaster walls should be coated with an alkali-resistant primer before applying putty. The base surface color should be consistent, with moisture content not exceeding 8% for concrete or plaster, and 12% for wood. The surface should be flat, vertical, and have proper angles as per the construction code. A seal coat should be applied before wallpapering, and the putty should be firm, non-powdery, and free from peeling or cracking. Finally, it's important to consider the environmental impact of the wallpaper adhesive used during the process.

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