Answer
For small concrete touch-ups, use 60 or 80, then 120. Hand sheets are not for large concrete grinding.
Why it happens
Concrete is hard and abrasive, so hand sandpaper is best for small touch-ups, not heavy grinding.
Recommended grit
Use 60, 80, or 120 for small concrete touch-ups. Use finer grits only after the high spots are removed.
Wet or dry
Dry; use dust control and protection.
Success check
The small concrete spot is smoother and no longer has sharp high points.
What to do
- Clean loose debris.
- Use 60 or 80 for rough high spots.
- Move to 120 for smoother touch-up.
- Stop when the edge or spot is level enough for the task.
Avoid: Do not expect hand sandpaper to replace a grinder for large concrete areas.