Dulux Avista Epoxy Concrete Crack Repair 1.5L — Structural Crack Filling Solution

The Dulux Avista Epoxy Concrete Crack Repair is a two-part, high-strength epoxy formulation specifically designed for the permanent structural repair of cracks in concrete surfaces. This 1.5-litre kit provides a flowable, self-levelling repair compound that penetrates deep into hairline and structural cracks, bonding tenaciously to the concrete to restore strength and prevent further crack propagation and water ingress.

Suitable for both interior and exterior concrete surfaces, this epoxy repair system is an essential preparatory step before sealing or coating — ensuring cracks do not telegraph through the new finish or allow moisture to undermine the coating from beneath. It is compatible with all Dulux Avista concrete sealer and coating systems once fully cured.

Key Features & Benefits

• Structural Repair: Restores the structural integrity of cracked concrete — not merely a cosmetic filler.
• Low Viscosity: Flows deep into fine cracks for complete penetration and a monolithic bond.
• Excellent Adhesion: Bonds strongly to clean, dry concrete for a permanent, long-lasting repair.
• Prevents Further Damage: Seals cracks against water ingress, preventing freeze-thaw damage, reinforcement corrosion, and sub-base erosion.
• Paintable & Sealable: Once cured, the repair can be overcoated with Dulux Avista sealers, epoxy, or urethane systems.
• Compact Kit: 1.5L size ideal for spot repairs, crack filling, and small-area remediation before full surface sealing.

Ideal Applications

• Filling cracks in concrete driveways and paths before sealing
• Repairing garage and workshop floor cracks prior to epoxy coating
• Sealing cracks in concrete patios and alfresco areas
• Preparing damaged concrete for resurfacing or overlay systems
• Structural crack injection for interior and exterior slabs

Application Guidance

Surface Preparation: The crack must be clean, dry, and free from dust, oil, grease, and loose material. Use compressed air or a vacuum to remove debris from within the crack. For best results, the crack should be chased (widened slightly at the surface with an angle grinder) to create a key for the repair material.

Mixing: Combine the two parts according to the kit instructions and mix thoroughly until a uniform colour is achieved. Pot life is limited — mix only what can be applied within the working time.

Application: Pour or inject the mixed epoxy directly into the crack, allowing it to flow and fill the void completely. For deeper cracks, multiple applications may be required as the epoxy settles. Overfill slightly to allow for shrinkage during cure, then sand or grind flush once hardened.

Cure Time: Allow the epoxy to cure fully according to the product instructions before sanding, coating, or subjecting to traffic. Cure time depends on temperature — warmer conditions accelerate the cure.

Clean-Up: Clean tools with a suitable solvent immediately after use — once cured, epoxy is extremely difficult to remove.

Frequently Asked Questions

1. What size cracks can this product repair?

This epoxy is designed for hairline to medium cracks up to approximately 5 mm in width. Its low viscosity allows it to penetrate very fine cracks that surface fillers cannot reach. For wider cracks or structural joints exceeding 5 mm, consider a sand-filled epoxy mortar or consult a concrete repair specialist for an appropriate system.

2. Can I apply a sealer or epoxy floor coating over the repaired crack?

Yes. Once fully cured, the epoxy crack repair can be sanded flush and overcoated with any Dulux Avista sealer, epoxy, urethane, or polyaspartic system. This is in fact the recommended workflow — repair cracks first, then coat the entire surface for a seamless, protected finish.

3. Will the repair be visible after sealing?

The repair itself will be visible as a slightly different texture and colour compared to the surrounding concrete. If you are applying a clear sealer, the filled crack will be noticeable — this is normal and unavoidable with crack repairs. If a completely uniform appearance is required, consider a coloured or tinted sealer, a resurfacing compound, or a flake flooring system that disguises repairs within the decorative finish.

4. How long does the repair last?

When applied to a properly prepared crack in stable concrete, an epoxy crack repair is permanent — it will not shrink, crack, or debond under normal conditions. However, if the underlying concrete continues to move (due to subsidence, thermal expansion, or structural loading), new cracks may form adjacent to the repair. Epoxy repairs the crack; it does not stabilise a moving slab.

5. Can I use this outdoors in wet conditions?

No. The crack and surrounding concrete must be completely dry before application. Moisture prevents proper adhesion and can cause the epoxy to foam or fail to cure. If water is seeping through the crack, the source of the water ingress must be addressed before attempting repair. For actively leaking cracks, consult a waterproofing specialist.

6. Is this product suitable for vertical or overhead cracks?

Due to its low viscosity and flowable nature, this product is best suited to horizontal surfaces where it can flow into and fill the crack by gravity. For vertical or overhead crack repairs, a thixotropic (non-sag) epoxy putty or gel formulation is recommended.