It is fine to put a new wallpaper over an old wallpaper. Just make sure to sand down any uneven areas such as damage or old wallpaper seams. Fill and sand the walls smooth so that no nicks or surface differences can be felt when brushing your hand along the wall.
All wallpapers have very good opacity – at least 99% – which means that patterns and colours from previous layers of wallpaper will not be visible.
For glass fiber or other painted woven fabrics on the walls.
Clean the surface with sugar soap and then rinse. Skim fill, sand or hang Easy Liner before wallpapering.
For textile, hessian, natural fiber wallpapers or similar on the walls.
Take down the wallpaper. Use a wallpaper stripper if it is difficult to remove. Fill and sand the surface so that it is smooth.
For painted surfaces.
Clean with sugar soap or similar and rinse carefully. Scrape out any cracks and scratch off flakes. Fill and sand down.
For concrete and plastered surfaces
Fill any uneven areas and seams. Skim fill the entire surface and sand down. Dust off the surface.
For plasterboard, chipboard and fiberboard
Fill nail and screw holes. Fill the panel joints using jointing tape or glue them using a textile adhesive. All filling should be done with sand filler. Sand the surface. Chipboard joints should be primed using alkyd paint to prevent curling at the edges.
Tools needed1. Bucket of clean water and sponge
2. Spirit level or plumb line
4. Wallpapering tool
6. Seam roller
7. Folding rule
9. Wallpaper knife
10. Non-woven wallpaper glue