Answer
For drywall corner bead, use 150 or 180 to level, then 220 for final smoothing.
Why it happens
Joint compound around corner bead needs smoothing without cutting into tape, metal, or paper.
Recommended grit
Use 150 or 180 for leveling, then 220 for final smoothing.
Wet or dry
Dry.
Success check
The corner feels smooth and blends into the wall.
What to do
- Let the joint compound dry fully.
- Level ridges with 150 or 180.
- Finish with 220.
- Remove dust before primer.
Avoid: Do not sand through paper tape or expose the bead edge.