Building & renovation
How much Venetian plaster and fixative do you need?
Stucco veneziano and fixative primer — kg and packs for both from wall m² and editable consumption rates.
Quick answer
A Venetian stucco job is two product lines, not one — and the fixative is the cheap half that decides whether the expensive half holds.
Advanced settings
Venetian plaster
92.4 kg → 4 Plaster packs
- Fixative
- 4.95 kg → 1 Fixative packs
Venetian stucco is applied in multiple thin coats then burnished — typical total 2–3.5 kg/m² on prepared walls. Fixative on absorbent plaster is often 0.1–0.2 kg/m² (≈0.1–0.2 L/m² diluted). Sealers and wax are not included here.
How it works
| Product | Rate | On a 30 m² wall (10% waste) |
|---|---|---|
| Fixative, on absorbent plaster | ≈0.15 kg/m² | ~5 kg → 1 pack of 5 kg |
| Decorative stucco, burnished finish | ≈2.8 kg/m² | ~92 kg → 4 sacks of 25 kg |
Rates are editable — polished finishes with more passes use more stucco; skip fixative only on already sealed surfaces (not recommended on chalky old plaster). Wax and sealer topcoats are ordered separately.
Burnishing is a skill job — budget practice board before you open a 25 kg sack on a 30 m² feature wall. Apply plaster fixative thin and even; trowel Venetian plaster in multiple thin passes with a polishing trowel; seal with decorative wax only after full cure. Fixative kg and stucco kg are separate lines in the calculator output.
Order the wax with the stucco and test it, because the finishing wax or sealer darkens the colour noticeably — often by a shade or more — and a sample board judged unwaxed tells you nothing about the wall you will end up with. Make the test board, wax half of it, and choose from the waxed half. The other habit that separates a good job from a patchy one is how you look at it: this finish is read in raking light, so work standing along the wall with the light running across it rather than facing it square, which is the only way you see the trowel marks while you can still fix them.
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Frequently asked questions
Is fixative mandatory before Venetian plaster?+
On new or porous mineral plaster, yes — it stabilizes suction and prevents dry-back that causes cracking. On already primed drywall or fixed old paint, a light fixative coat may be optional; ask your supplier. Skipping fixative on chalky lime plaster is the most common reason stucco cracks within months.
How many kg of stucco per m²?+
Burnished Venetian finishes commonly land at 2–3.5 kg/m² total depending on passes and aggregate size. Enter what your TDS states — this calculator multiplies by area and rounds to pack sizes.
Same product for fixative and stucco?+
Usually not — fixative is a dilutable primer; stucco is the decorative lime paste. Some systems sell a single base — if yours does, combine the kg/m² in one field on the microcement/marmorino tool instead.
What pack sizes to order?+
Stucco commonly ships in 25 kg sacks; fixative in 5 kg buckets or 10 L cans (~1 kg/L). Adjust pack sizes in advanced — the output shows how many whole units to buy.
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