Wallpaper Over Plaster Walls: A Comprehensive Guide
Decorating your home with wallpaper can be a great way to add a personal touch and create a unique atmosphere. However, if you're planning to apply wallpaper over plaster walls, you'll want to make sure you do it correctly to achieve a smooth and long-lasting finish. In this article, we'll explore the ins and outs of wallpapering over plaster walls, including the preparation, application, and maintenance of this type of installation.
Preparation is Key
Before you start applying wallpaper, it's essential to prepare your plaster walls properly. This involves cleaning the walls, filling any holes or cracks, and applying a primer to ensure a smooth surface. Make sure to remove any old wallpaper, paint, or other decorations, and wash the walls with a mild detergent to remove any dirt or grime.
Next, fill any holes or cracks with a joint compound and sand it smooth. This will help create a uniform surface for your wallpaper to adhere to. If your walls have any uneven areas or ridges, use a level to ensure they're straight and apply a skim coat of joint compound to fill in any gaps.

The Importance of a Good Primer
A good primer is essential when applying wallpaper over plaster walls. It helps create a strong bond between the wallpaper and the wall, ensuring that the paper stays in place and doesn't peel or bubble. Look for a primer specifically designed for use with wallpaper and follow the manufacturer's instructions for application.
Apply the primer with a roller or brush, making sure to cover the entire surface of the wall. Allow the primer to dry completely before moving on to the next step.
The Application Process
Now that your walls are prepared and primed, it's time to apply the wallpaper. Begin by cutting the wallpaper into sections, using a utility knife or a wallpaper cutter. Apply the first section to the wall, starting from the center and working your way outwards. Use a level to ensure the paper is straight and a smooth, even motion to avoid air bubbles.

Continue applying the wallpaper sections, overlapping each section by about 1/2 inch. Use a brush or a foam roller to smooth out any air bubbles or wrinkles, and use a damp cloth to remove any excess paste or adhesive.
Removing Old Wallpaper
If you're dealing with old wallpaper that's been applied over plaster walls, you'll need to remove it before applying new wallpaper. Use a wallpaper remover or a solution of equal parts water and fabric softener to loosen the old adhesive. Scrape off the old wallpaper with a putty knife or a scraper, working from the top down to avoid spreading the adhesive.
Once the old wallpaper is removed, clean the walls thoroughly with a mild detergent and water to remove any remaining adhesive or debris. Allow the walls to dry completely before applying a new primer and proceeding with the application process.
Maintenance and Repair
With proper care and maintenance, your wallpaper over plaster walls can last for many years. Avoid using harsh chemicals or abrasive cleaners, which can damage the wallpaper or the plaster. Instead, use a gentle cleaner and a soft cloth to clean the wallpaper and walls.
Regularly inspect the wallpaper for any signs of damage or wear, such as tears, bubbles, or peeling. Address any issues promptly to prevent further damage and ensure a long-lasting finish.
Common Mistakes to Avoid
- Not preparing the walls properly before applying wallpaper.
- Using the wrong type of primer or adhesive.
- Applying wallpaper over uneven or damaged surfaces.
- Not smoothing out air bubbles or wrinkles.
- Using harsh chemicals or abrasive cleaners.
Conclusion
Wallpapering over plaster walls can be a rewarding and cost-effective way to decorate your home. By following these guidelines and tips, you can achieve a smooth and long-lasting finish that will enhance the beauty of your home for years to come.