Answer
For Venetian plaster, avoid coarse sanding. Test 600 or finer lightly in a hidden area.
Why it happens
Decorative plaster finishes rely on burnishing and surface texture, so sanding can change the look.
Recommended grit
Avoid coarse sanding. For small corrections, test 600 or finer very lightly.
Wet or dry
Dry unless the finish maker specifies otherwise.
Success check
The correction does not create a visible dull patch.
What to do
- Identify whether the finish is sealed or unsealed.
- Test a hidden spot first.
- Use 600 or finer only for small corrections.
- Stop if sheen or color changes unevenly.
Avoid: Do not use coarse grit on decorative plaster finish.