Plastering over a damaged or faulty surface can lead to unsatisfactory results.
2. Style and Thickness of the Wallpaper:
The type and thickness of the wallpaper can also have an impact on whether you can apply plaster over it successfully. Thin, smooth wallpapers tend to work better for this purpose compared to thicker or textured varieties.
3. Desired Surface Finish:
Consider the final look you wish to achieve. Plastering over existing wallpaper will add an extra layer to the wall, possibly altering the texture and appearance. If you desire a completely smooth finish, removing the wallpaper might be a better option.
Steps to Applying Plaster over Wallpaper:
If you decide to proceed with plastering over wallpaper, follow these steps to ensure a successful outcome:
1. Preparation:
Thoroughly clean the wallpaper surface, removing any dirt, grease, or loose material. Use a wall cleaner or warm, soapy water, and a sponge or cloth to gently wipe the wallpaper. Allow the surface to dry completely before proceeding.
2. Primer Application:
Apply a high-quality primer specifically designed for wallpaper. This will create a suitable base for the plaster to adhere to and prevent any potential issues such as bubbling or peeling.
3. Applying Plaster:
Using a trowel or plastering tool, apply a thin layer of plaster over the wallpaper surface. Be sure to smooth it evenly, ensuring there are no thick or uneven areas. Allow the plaster to dry according to the manufacturer’s instructions.
4. Sanding and Finishing:
Once the plaster has fully dried, gently sand the surface to achieve a smooth finish. Use fine-grit sandpaper and proceed gradually to avoid damaging the underlying wallpaper. Remove any dust or debris resulting from sanding before proceeding to the next step.
5. Painting or Wallpapering:
If you desire a painted finish, apply a suitable primer over the plastered and sanded surface. Once the primer is dry, proceed with your desired paint color. Alternatively, if you prefer to maintain a wallpapered look, you can add a layer of adhesive wallpaper directly over the plaster.
Pros and Cons of Plastering over Wallpaper:
Pros:
- Saving time and effort: Plastering over wallpaper eliminates the need for time-consuming wallpaper removal.
- Increased wall durability: The added layer of plaster can provide extra strength and protection to the wall surface.
- Cost-efficient: Removing old wallpaper and rewallpapering or painting are more expensive alternatives in terms of time, materials, and labor.
Cons:
- Texture and appearance changes: Applying plaster over wallpaper can alter the texture and visual appearance of the wall, which may not be desirable if you prefer a seamless or completely smooth finish.
- Potential for issues: If the wallpaper is of poor quality, damaged, or peeling, applying plaster over it may result in further issues such as bubbling, unevenness, or failure of adherence.
- Limited design flexibility: Once plastered, you are limited to the options of either painting or adding another layer of wallpaper on top. Removing the plastered layer can be difficult and time-consuming.
While it is possible to apply plaster over wallpaper, careful consideration of factors such as the condition of the wallpaper, desired surface finish, and overall goals of the project is essential. Following the correct steps and being aware of the potential pros and cons will help you make an informed decision that best suits your needs and preferences.