PRIMO STRATO Mineral Primer | Venetian Plaster Base Coat

Carlos M

Verified Purchase

I’ve tested a lot of quartz primers and this one has a really nice grit to it without being overly aggressive. Great base for fine finishes.

Mei L

Verified Purchase

Works great and easy to use...So far so good

Theresa A

Verified Purchase

I use this for my artwork and it is the best i've found! I also appreciate the quick answers from them

Rachel P

Verified Purchase

Customer service recommended this under Grassello and I’m glad I listened. Everything applied much smoother afterward.

Jason R

Verified Purchase

Thank you for rushing this out, we got it just in time

EVERY FINISH STARTS HERE

Zero VOC

5 g/l

100% Natural

Mineral ingredients

Interior & Exterior

All substrates

Easy Application

Roller or Brush

Made in Italy

Vicenza

Tech Specs Safety Sheet Application Video

How to Apply

Application

Prepare the Surface

Surface must be clean, dry, and free of dust, oil, grease, and loose material. Fill any cracks or irregularities and allow repairs to cure fully before proceeding.

Dilute if Required

PRIMO STRATO is ready to use straight from the bucket on most surfaces. On new drywall, it can be diluted up to 25% with clean water to aid penetration into the substrate.

Apply

Apply one even coat using a brush or short-nap roller. Work in sections and maintain a wet edge to avoid lap marks. Ensure full, consistent coverage across the entire surface.

Allow to Dry

Allow PRIMO STRATO to dry fully before applying your first coat of lime plaster. Drying time varies with temperature and humidity. The surface should feel completely dry and non-tacky to the touch.

Where to Use

Compatible Surfaces

✓ New and existing drywall / gypsum board
✓ Concrete and cement board
✓ Brick and masonry
✓ Existing plaster and stucco
✓ Previously painted surfaces (sound and clean)
✓ Exterior substrates
✗ Surfaces with active moisture or efflorescence
✗ Glossy or non-porous surfaces without sanding

Good to Know

Important Notes

One coat is sufficient on most surfaces. Do not apply a second coat in place of allowing the first to dry fully.
On new drywall, dilute up to 25% with clean water. On denser or previously painted surfaces, apply undiluted for maximum adhesion.
Do not apply lime plaster over PRIMO STRATO until it is completely dry. Applying over a damp primer is a common cause of adhesion failure.
For exterior use, ensure the substrate is structurally sound and free of active water ingress before priming.
Refer to the PRIMO STRATO Safety Data Sheet for full handling, PPE, and disposal requirements.

Questions

Frequently Asked

Lime plasters require a prepared, bonded surface to adhere correctly. Without a proper primer, the substrate can absorb moisture unevenly from the plaster, leading to poor adhesion, cracking, or delamination. PRIMO STRATO is a micro-granular quartz primer, meaning it does not just seal the surface — it creates a fine textured profile that the lime plaster locks into mechanically. This is what gives Violante plasters their long-term durability.

We recommend PRIMO STRATO because it is specifically formulated to work with our lime plasters. Generic bonding primers or PVA sealers can reduce porosity too aggressively or leave a surface that is too smooth for lime plaster adhesion. If you use a third-party primer, test adhesion on a small area first and ensure it is compatible with lime-based products before proceeding.

Drying time varies depending on temperature, humidity, and substrate porosity. In normal conditions, expect 2 to 4 hours. In cooler or more humid environments, allow longer. The surface should feel completely dry and non-tacky before applying your first coat of plaster. When in doubt, wait longer — applying over damp primer is a common cause of adhesion issues.

Not usually. PRIMO STRATO is ready to use straight from the bucket on most surfaces. The exception is new drywall, where the paper face can be highly absorbent — in this case, diluting up to 25% with clean water helps the primer penetrate evenly. On previously painted or denser surfaces, apply undiluted.

Yes. PRIMO STRATO is suitable for both interior and exterior use. For exterior applications, ensure the substrate is structurally sound, free of active moisture, and fully cured before priming. Protect the primed surface from rain until dry.

Once PRIMO STRATO is completely dry you can begin your first coat of plaster. There is no maximum window — if the primer has been applied and dried, it remains effective. If the primed surface gets wet or is exposed to heavy dust before plastering, clean and allow to dry again before proceeding.

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