So, you should go for the 120-grit to 150-grit sandpaper. 120-grit Sandpaper is the best to start with your sanding drywall because of the roughness of the wall. Once you get a smoother sanded wall, you might as well use the 150-grit sandpaper to get a better finishing.Click to see full answer. Thereof, what grit sandpaper is best for drywall?Once thoroughly dry, use a 100 or 120 grit sandpaper, 150 or 220 grit sand screen or Fine sanding sponge to smooth out the joint compound. Pay special attention to properly sand and smooth the outer edge of the joint compound so that it blends with the existing wall.Likewise, how do you smooth drywall with sand? When using a sponge, a wet sanding method is typically most effective: Fully submerge the sponge in water and squeeze out the excess. Rub the coarse side against the drywall in a circular motion, making sure to work into the edges so all areas are smooth. Continue rubbing until the area softens to an even surface. In this way, can you use regular sandpaper on drywall? Sandpaper Grit Grits below 100 are too coarse for use on drywall. Even though they work quickly, the gouges they make in dried joint compound are deep enough to be visible under paint. Coarser 120-grit paper is suitable for rough-sanding most projects, and a final once-over with 150-grit paper is optional.Do I need to sand drywall before painting? Prime the walls, then sand again Sanding after priming is a critical step that most beginners skip. But sanding before painting removes paper fuzz and lumps that will show through your paint job. This is also the time to take care of other imperfections by filling them with joint compound.