Answer
For rough grout edges, use 220 or 320 lightly while protecting the tile face.
Why it happens
Grout ridges need controlled smoothing without scratching the tile face.
Recommended grit
Use 220 or 320 lightly on rough grout edges, then clean dust.
Wet or dry
Dry or lightly damp depending on grout condition.
Success check
The grout edge feels smoother and the tile is not scratched.
What to do
- Let the grout cure enough to sand without crumbling.
- Protect the tile face from scratches.
- Smooth rough edges with 220 or 320.
- Vacuum or wipe residue.
Avoid: Do not sand glazed tile faces while smoothing grout.