3 Ways to Sand Drywall - wikiHow
Jan 24, 2020 · Sand outward so that you taper the mud down to the wall. In other words, sand along the corner in broad strokes, then slowly move those strokes outward toward the edge of the mud. You can also try wet sanding, which cuts down on dust. Dip a sanding block in warm water and wring it out thoroughly before using it on the wall.