Pre-treatment of wall surfaces
What characteristics must the wall surface have?
Correct pre-treatment of the wall surface is a prerequisite for perfect wallpapering. Skipping the preparatory work can adversely affect the whole wallpapering job in the long term.
Do old wallpapers need to be removed before wallpapering?
The old wallpaper must always be removed before wallpapering. Hanging new paper onto an existing one presents the risk of poor adhesion or seam reaction, or that the wallpaper underneath will show through.
The old wallpaper can be removed by hand with water, wallpaper stripper, ceiling brush and scraper. Old wallpapers that are hard to get off even after soaking several times should be perforated with a wallpaper perforator. This helps to remove washable and scrubbable wallpapers. If a dispersion adhesive has been used for the old wallpaper, often only mechanical steaming with a hot steamer will help.
Some wallcoverings are peelable. That means, the surface layer can be peeled off dry and only a thin layer of paper, the lining, remains. This then serves as the base for the new wallpaper but must only be used if it adheres firmly to the wall. This can be checked by wetting the old wallpaper with water in a few places and then waiting for about 15 minutes. If no blisters have formed, the lining can be papered over.
What do I do if there is old paint on the wall?
Old, unstable or cracked paint or varnish must be removed before wallpapering. This can be done by sanding down or scraping off. In difficult cases, stripping off the paint residue can help.
What do I do if there is a coating of size or emulsion paint on the wall?
Old coats of size must be thoroughly washed off with water. Adding wallpaper stripper will make the work significantly easier.
Apply a water-wallpaper stripper solution to wipe-proof emulsion paints (referred to as mixed binder paint) and leave to soak. The paint can then be removed. After cleaning, stabilise the wall surface with a water-based wallpaper primer.
What should be done if there is varnish or oil paint or metal on the wall?
These surfaces are not suitable for wallpapering. However, with careful preparation you may be able to paper these surfaces. First, you need to remove any parting agents, such as dust, grease or dirt. Then you need to apply a lining paper (for instance MAKU-Vlies by A.S. Création) with a dispersion adhesive (e.g. Metylan Ovalit T).
How should I pre-treat mineral wall surfaces?
Firm mineral wall surfaces (new plastering) should be pre-pasted with diluted wallpaper paste. For other types of mineral wall surface, e.g. concrete, plasterboard or plaster based fillers, it is advisable to prime the walls with a deep-acting solvent primer.
Sandy or heavily absorbent surfaces must also be stabilised with a deep-acting solvent primer.
What is the best way to prepare the wall?
A.S. Création's MAKU non-woven lining paper creates the perfect surface for wallpapering and prevents seam splitting. It also equalises the tension between wall and wallpaper and produces an even light-coloured wall surface.
Is special pre-treatment required when working with non-woven wallpaper or paper products?
Due to its poor absorbency, new gypsum plaster needs to be primed with paste (according to manufacturer's instructions). All other surfaces (concrete, plasterboard, gypsum fibre board etc.) must be treated with deep-acting primer.