If the wall of old house is painted, does it ok to paste wallpaper directly on the wall? Specialist suggests that people should check the condition of wall before start. If the old paint is compact and there is no peeling phenomenon, you can apply primer directly on the wall. Primer has the function of firming the wall, increasing the adhesive force of wallpaper, and protecting the wall when tear down wallpaper. If the paint is unstable, you must remove the old paint.
What should Ido about the old wallpaper on the wall when refurbishing? Does it ok to apply new wallpaper directly on the old without special treatment? Generally, you must deal the problem before pasting wallpaper.
The situation can be different, if the old wallpaper has high purity, such as high purity wood pulp wallpaper. Here is an easy way to test whether you need to remove the old wallpaper: put wet rag on the wallpaper; wait for 10 minutes; check whether there is bulging phenomenon. You can apply new wallpaper directly on the old one if there is no bulging phenomenon. On the contrary, you need to remove the old wallpaper and have substrate treatment.
Anti-cracking treatment of gypsumsubstrate
If the wall substrate is plasterboard, you need to have moisture proof treatment before you apply wallpaper. The first step is to coat antirust paint on the screw spike to prevent the rust eroding wallpaper. Then fix the joint of plasterboard with white emulsion and gypsum powder. This can prevent the gypsum having crack for contraction. Someone may have the doubt of why gypsum powder is used? Can I use putty? The answer is no. the reason is that gypsum powder and gypsum belongs to the same material. They have sameexpansion and shrinkage coefficient. Putty has different shrinkage coefficient with gypsum. It will crack in the future.
In order to enhance the anti-crack effect, bandage must be used in the joint after the gypsum powder is dry. At present, there is dacron cloth, dacron cloth and grid gauze. The binding power of grid gauze is poor, so it is not recommended. Grinding and applying putty after the above measures are taken.
Anti-deformation of wooden substrate
If you need to apply wallpaper on the wooden board, what measures should you take to prevent deformation? First, you need to brush a layer of oil paint on the wooden substrate to prevent it deform. Fix the crack with unsaturated polyester resin putty, not gypsum powder. This is because unsaturated polyester resin putty has high hardness and good stability, this make it free of convergent-divergent.
The next step is to apply putty. Mix white emulsion and water in the proportion of 1: 1. Apply it on the wall. The function of putty is to make the wood board flat. Grind the substrate with sandpaper and apply a layer of solvent type paint or water paint to prevent the deformation of wooden substrate. You can start to paste wallpaper after the above procedures are done.
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