Ensuring the wall is smooth, clean and completely dry is key for a successful installation. The surface should be free from old backing paper and contaminants such as dirt, dust, grease, mildew, ink stains; any of these can prevent adhesion taking place. 1. Remove nails / screws and fill in any cracks. 2. Switch off the electricity mains and remove any socket / switch covers. 3. Sand down any rough areas until smooth. 4. Use a sponge to clean the walls with warm water and mild soap, allow the walls to dry for a minimum of 24 hours. 5. Paint the wall a light uniform colour if it differs significantly from your wallpaper as dark patterns / colours may show through. Important: Allow the wallpaper to acclimatise in the room it will be applied in for a minimum of 24 hours before application. To do this, take the wallpaper out of the packaging and slightly unravel. Wall surfaces Emulsion paint: Freshly painted walls should be left for 4 weeks before application, please refer to the paint manufacturers instructions for guidance. Follow general preparation instructions. Porous surface (plaster, cement render): Ensure old plaster is stable and free of mould and new plaster is completely dry. Cement render / concrete should be sanded smooth. Seal the wall with a primer or diluted paste (also known as wall size). Allow the primer to completely absorb / dry, this will stop paste being absorbed during installation. Plasterboard Spackle / fill in any screw holes and joints between plasterboards. Smooth and seal the wall with a primer or diluted paste (also known as wall size). Allow the primer to completely absorb / dry, this will stop paste being absorbed during installation.