what sandpaper for walls

When sanding walls before painting, the type of sandpaper to use depends on the state of the wall. As a general rule, start with a coarse or medium 80-grit sandpaper to get rid of any large ridges or uneven areas. Once all the large obstacles have been removed, change to a finer sandpaper such as 180-grit sandpaper to give a finish that is smooth to the touch. On drywalls, 120- or 150-grit sandpaper is probably the best bet, and sand using only light-to-moderate pressure. It is important to avoid using a coarse-grit of sandpaper as it can produce scratches, which then have to be removed by finer sandpaper. If you continue to go over the wall using a finer and finer grit of sandpaper, eventually, youll have walls that are close to flawlessly smooth. Sanding is not necessary for all walls, but if you need to sand, it is recommended to wear a mask to avoid inhaling any dust.