Available some simple methods to check the wall substrate. First, the wall should be smooth. Available two meters long ruler, or shine a flashlight through the wall, along the light to see, if there is no obvious injustice can. Next, the substrate needs to have a certain carrying capacity. You can use a fingernail scratch putty, if not draw down; or use stickers to paste on putty, putty scraped off if there is no tape peeled off, then putty has a certain carrying capacity, is qualified. Then, the water-absorbing walls reasonable. Water splashed on the wall, if the wall gets wet, wet paint splash into the glass level between the upstream and the water poured down between the sponge sucked, then you can. Fourth, PH value is neutral. Use PH test paper, can be presented as neutral. Fifth, the walls should be clean, color should be consistent, carefully observed by the naked eye. Sixth, the walls smooth. Wallpaper different products have different requirements, but the need to meet the requirements of all kinds of wallpaper. Seventh, pay attention to dry. In general, the moisture content of wooden panels need no more than 8%, wall moisture content does not exceed 12%.

PVC is a polymer, this material made of wall decorations wallpaper. It is pvc wallpaper.
PVC wallpaper surface mainly polyvinyl chloride resin, mainly in the following three ways:
A, ordinary type ------ to 80g / square meter of paper as the base paper, ash wood surface is coated with 100g / sqm PVC resin. Its surface decoration method is usually printed, embossed or printed with a combination of embossed.
B, foaming ------- to 100g / sqm paper is paper-based, applied to the surface 300-400g / square meter PVC resin. According to the size of the expansion ratio, there are low foaming and high foaming, respectively. Wherein the high elastic foam wallpaper surface embossed, it has a certain sound-absorbing effect. C, wherein the functional water ------ wallpaper is made of glass fiber cloth as a substrate, can be used to decorate the bathroom, bathroom wall; fire wallpaper is used 100-200g / square meter of asbestos paper as the substrate, and PVC surface material incorporated flame retardant.
PVC wallpaper has some water resistance, to facilitate construction. After the surface contamination, use a clean sponge or towel.