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    Concrete Repair

    Lavafinish polymer modified fiber reinforced cementitious fairing and reprofiling mortar by MATEX

    Lavafinish

    Polymer Modified Skim Cementitious Fiber Reinforced Fairing and Reprofiling Mortar

    LAVAFINISH is a premixed, polymer-modified, shrinkage-controlled skim coat designed to re-profile and fair concrete surfaces with voids between 3.0 and 20 mm. Comprising Portland cement, hydraulic binders, silica sand, and special additives, it delivers a smooth, durable finish suitable for horizontal, vertical, and overhead applications. LAVAFINISH provides excellent adhesion to concrete, making it ideal for surface repairs on walls, columns, and beams. It is re-coatable with cementitious products and offers strong resistance to salts, chlorides, and chemical attack. Its long-lasting performance and workability make it a versatile solution for durable and aesthetic concrete restoration.

    Technical data:
    • Appearance : Cement grey
    • Application Thickness : 3.0 to 20.0 mm
    • Coverage : 6.7 kg/square meter @ 3.0 mm thickness
    • Yield : 13.0 liter per 25 kg bag
    • Packaging : 25 kg bag
    Related Documents:

    How to Apply Lavafinish

    Lavafinish is mixed with water only and hand-applied by trowel to a saturated surface dry concrete substrate.

    1. Prepare the surface. The surface must be perfectly clean and free from grease, dust, contaminants, oil and loose material, and must not be coated with a curing compound film.
    2. Pre-wet to SSD. Soak the substrate with water and let the excess drain to a saturated surface dry (SSD) condition. Applying over dry concrete without saturation or a bonding agent will result in failure.
    3. Mix. Pour 3.75 to 4.0 liters of clean water into the mixing container and add the full 25 kg bag while mixing continuously with a low-speed heavy-duty mixer and spiral paddle (max 500 rpm) for at least 3 minutes until lump-free. Avoid entrapping air.
    4. Apply. Apply by trowel or spatula to the SSD concrete in layers of up to 20 mm, using a very clean tool to avoid scratching the fairing coat. Leave the surface rough if another layer is needed; the product can be applied on a fiber mesh layer where a high mechanical resistance plaster is required.
    5. Cure. Prevent rapid evaporation with light water fogging for 48 hours or a suitable MATEX curing agent. Do not start fogging until final set has been reached.
    6. Clean tools. Clean tools with water before the product hardens; hardened material can only be removed mechanically.

    Summary of the method in the Lavafinish Technical Data Sheet. Always follow the full TDS on site.

    Standards & Test Methods

    StandardTitleReferenced for
    EN 1504-9Products and systems for the protection and repair of concrete structures — General principles for the use of products and systemsListed in the TDS
    ASTM C109Standard Test Method for Compressive Strength of Hydraulic Cement Mortars (Using 2-in. or [50 mm] Cube Specimens)Compressive strength: ≥ 55 N/mm² at 28 days
    ASTM C580Standard Test Method for Flexural Strength and Modulus of Elasticity of Chemical-Resistant Mortars, Grouts, Monolithic Surfacings, and Polymer ConcretesFlexural strength: ≥ 9 N/mm² at 28 days
    BS 1881-207Testing concrete — Recommendations for the assessment of concrete strength by near-to-surface testsAdhesion bond to concrete: 1.5 N/mm2 at 28 days

    Standards and test methods as referenced in the Lavafinish Technical Data Sheet. Values in the TDS are typical laboratory results under standard conditions.

    Frequently Asked Questions

    What thickness can Lavafinish be applied at?

    The TDS states Lavafinish is applied for fairing of voids 3.0 to 20 mm, in layers with a maximum thickness of 20 mm.

    What is the coverage of Lavafinish?

    The TDS gives approximately 6.7 kg per square meter at 3.0 mm thickness, subject to site conditions.

    How much water is mixed with Lavafinish?

    Use 3.75 to 4.0 liters of clean water per 25 kg bag. The TDS yield is 13.0 liters per 25 kg bag when mixed with 4.0 liters of water.

    What is the workability time of Lavafinish?

    Workability is 35-45 minutes. Application temperature is from 5°C to +40°C, and the product should not be used below 5°C.

    How should Lavafinish be cured?

    Avoid rapid evaporation using light water fogging for 48 hours or a suitable MATEX curing agent, starting only after final set.

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