On drywalls, 120- or 150-grit sandpaper is probably your best bet, and sand using only light-to-moderate pressure. A very important tip is to close the door of the room where you’re working, so the dust and debris from the drywall doesn’t settle throughout the rest of the house.
Herein, how do you sand drywall before painting?
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.