Dulux Avista Exposed Aggregate Concrete Sealer — Enhance and Protect Your Exposed Stone Finish

The Dulux Avista Exposed Aggregate Concrete Sealer is a premium solvent-based clear coating specifically formulated for exposed aggregate concrete surfaces. Engineered to bring out the rich, natural colours of the stones and pebbles in your exposed aggregate finish, this sealer delivers a beautiful semi-gloss wet-look sheen whilst providing robust protection against the harsh Australian elements.

Unlike general-purpose concrete sealers, this product is purpose-designed for the unique surface profile of exposed aggregate — where a mix of smooth stone, rough cement matrix, and variable porosity demands a specialised formulation. The result is a durable, UV-resistant finish that enhances colour depth, resists staining, and protects your investment in decorative concrete for years to come.

Key Features & Benefits

• Purpose-Designed for Exposed Aggregate: Formulated specifically for the unique texture and porosity of exposed aggregate surfaces — not a general-purpose product adapted for the task.
• Semi-Gloss Wet-Look Finish: Enhances the natural colours and character of your stones, creating a rich, polished appearance that makes aggregate colours pop.
• Very Good UV Resistance: Protects against the degrading effects of Australian sunlight, helping prevent fading and discolouration of both the sealer and the underlying surface.
• Excellent Chemical Resistance: Withstands exposure to common chemicals including chlorine, salt, alkali cleaners, and incidental fuel spills once fully cured.
• Suitable for Old and New Surfaces: Can be applied to both freshly laid exposed aggregate and older surfaces requiring rejuvenation.
• Solvent-Based Durability: Provides superior penetration and film hardness for long-lasting protection in exterior conditions.

Ideal Applications

• Exposed aggregate driveways
• Exposed aggregate pathways and garden edges
• Exposed aggregate patios and alfresco areas
• Pool surrounds with exposed aggregate finish
• Commercial landscaping with exposed aggregate

Application Guidance

Surface Preparation: The surface must be clean, dry, and free from dust, dirt, oil, grease, moss, and loose material. New exposed aggregate must be fully cured (minimum 28 days). For previously sealed surfaces, ensure the existing coating is sound — strip failing sealers completely before application.

Application: Apply by roller using a solvent-resistant sleeve. Work the sealer into the textured surface, ensuring even coverage across both the stones and the cement matrix. Two thin coats are recommended for optimal protection and appearance.

Coverage: Approximately 3–5 m² per litre per coat, depending on the aggregate profile and porosity of the surface. Highly textured finishes will consume more product.

Drying & Curing (at 25 °C, 50% RH):

• Recoat: 3 hours
• Rain resistance: 2 hours
• Foot traffic: 24 hours
• Vehicle traffic: 5 days

Important Safety Note: Sealing exposed aggregate on an incline — such as a sloped driveway — may cause the surface to become slippery, particularly when wet. For inclined surfaces and pool surrounds, the addition of a slip-resistant additive (such as Dulux Avista Slip Res Additive Crushed Glass) to the final coat is strongly recommended.

Clean-Up: Clean tools and equipment with mineral turpentine or a suitable solvent.

Frequently Asked Questions

1. Why do I need a sealer specifically for exposed aggregate — why not just use a general-purpose sealer?

Exposed aggregate surfaces have a unique profile: smooth, non-porous stones set within a more porous cement matrix. A general-purpose sealer may absorb unevenly — soaking into the matrix but sitting on the stones — leading to a patchy, inconsistent finish. The Dulux Avista Exposed Aggregate Sealer is formulated to deliver consistent coverage and appearance across both materials, ensuring the stones are enhanced and the matrix is protected in equal measure.

2. Will this sealer make my exposed aggregate look glossy and artificial?

The finish is best described as a semi-gloss wet look — it deepens and enriches the natural stone colours without creating an unnatural, high-gloss plastic appearance. The stones will look vibrant and polished, much like they do when wet with water, but the texture and character of the aggregate remain clearly visible. If you prefer a completely natural, no-sheen appearance, consider the Dulux Avista Water Based Penetrating Sealer instead.

3. How soon after laying exposed aggregate can I seal it?

You must wait until the concrete is fully cured — a minimum of 28 days from the date of pour. Sealing too early traps residual moisture from the curing process, which can lead to whitening (blushing), blistering, and adhesion failure. If a surface retarder was used to expose the aggregate, the wash-off should have been completed and the surface allowed to dry thoroughly before sealing.

4. Will my driveway become slippery after sealing?

It can — particularly if the driveway has a noticeable slope. All film-forming sealers reduce the natural micro-texture of concrete to some degree. For sloped driveways, pool surrounds, and high-traffic pedestrian areas, we strongly recommend adding the Dulux Avista Slip Res Additive (Crushed Glass) to the final coat of sealer. This maintains grip without affecting the clarity or appearance of the finish.

5. How long will the sealer last on an exposed aggregate driveway?

Under normal Australian residential conditions, expect 2–4 years before a maintenance coat is required. Driveways that experience heavy vehicle traffic, direct all-day sun, or exposure to pool chemicals may need attention sooner. Tell-tale signs include loss of the wet-look sheen, fading of aggregate colours, and water no longer beading on the surface. A simple maintenance coat applied before the sealer fully degrades is far easier and cheaper than a full strip and reseal.

6. Can I use this sealer on other types of concrete?

This product is specifically formulated for exposed aggregate and is not recommended for other concrete types such as plain, stencilled, or stamped concrete. Using it on non-aggregate surfaces may result in suboptimal adhesion, uneven appearance, or reduced durability. For plain and decorative concrete, choose from the Dulux Avista General Purpose Sealer (Matt or Semi-Gloss), Extended Wear Sealer, or Waterbased Sealer — all of which are purpose-designed for those substrates.

7. How do I clean and maintain a sealed exposed aggregate surface?

Regular sweeping and occasional hosing are usually sufficient for day-to-day maintenance. For more thorough cleaning, use a pH-neutral detergent and a soft-bristled broom — avoid acidic cleaners, high-pressure washers on a concentrated setting, and stiff wire brushes, all of which can damage the sealer film. If moss or algae develops in shaded areas, treat with a dilute chlorine solution (no stronger than 5%) and rinse thoroughly. When water stops beading on the surface, it is time for a maintenance coat.