Sizing a wall with wallpaper paste involves applying a thin layer of diluted paste to prepare the surface for better wallpaper adhesion. This is especially important when wallpapering over painted walls.
Why Size a Wall Before Wallpapering?
Sizing is a crucial step in wallpapering, particularly over painted surfaces. It serves several purposes:
- Improves Adhesion: It creates a slightly tacky surface that helps the wallpaper stick more effectively.
- Reduces Absorption: Sizing seals the wall, preventing the wallpaper paste from being absorbed too quickly into the wall. This allows the wallpaper to slide easily for positioning before it sets.
- Ensures Even Drying: By creating a uniform surface, sizing helps the wallpaper dry evenly, reducing the chance of bubbles or seams lifting.
Steps to Size a Wall with Wallpaper Paste
Here's how to size a wall using wallpaper paste:
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Prepare the Wall: If the wall is painted, lightly sand it with sandpaper to roughen the surface. This will enhance the adhesion of the sizing and wallpaper paste.
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Dilute the Wallpaper Paste: Mix wallpaper paste with water at a 50/50 ratio. This creates a thin consistency suitable for sizing. For example, if you use 1 cup of paste, add 1 cup of water.
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Apply the Sizing: Use a paint roller or a large brush to apply the diluted paste evenly over the entire wall surface. Aim for a thin coat. Avoid applying the paste too thickly.
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Allow to Dry: Let the diluted paste dry completely. The wall should be slightly tacky, but not wet. The drying time can vary depending on the room temperature and humidity.
Summary of Sizing a Wall
| Step | Action |
|---|---|
| 1. Prepare the Surface | Lightly sand painted walls to create a rough surface. |
| 2. Dilute the Paste | Mix wallpaper paste and water in a 50:50 ratio (e.g., 1 part paste to 1 part water). |
| 3. Apply the Sizing | Apply a thin coat of the diluted paste to the wall using a roller or brush. |
| 4. Allow to Dry | Let the sizing dry completely, the wall should be slightly tacky. |
By following these steps, you can effectively size a wall, ensuring better adhesion and longevity of your wallpaper.
