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    Joint Sealant

    Megaseal Acryl white acrylic joint sealant by MATEX applied around a window frame

    Megaseal Acryl

    Single Component General Purpose Acrylic Joint Sealant

    MEGASEAL ACRYL is a versatile, single-component acrylic sealant designed for sealing joints around windows, doors, skirtings, and more. It provides excellent adhesion to porous surfaces and remains flexible after curing. MEGASEAL ACRYL is easy to apply, paintable with emulsion or alkyd paints, and resists weathering for long-lasting protection. Perfect for interior use, it acts as a durable filler for cracks and gaps in concrete and masonry. Its smooth finish and economical use make it ideal for residential, commercial, and light industrial applications where flexibility and appearance matter.

    Technical data:
    • Appearance : white paste (other colors upon request)
    • MAF : +/- 10%
    • Application Temperature : 10°C to 40°C
    • Service Temperature : -5°C to 80°C
    • Cure time @ 25°C : approx. 1mm/day
    • Consumption : depends on joint size
    • Packaging : 5 kg plastic pail
    Related Documents:

    How to Apply Megaseal Acryl

    Megaseal Acryl is a ready-to-use water based acrylic sealant gunned or troweled into a prepared, masked joint and smoothed with a damp sponge.

    1. Prepare the joint. Joint surfaces should be sound, clean, dry and free from loose material, laitance, dirt, oil and grease, with concrete fully cured. Clean the joint with hand mechanical tools and re-profile damaged edges with a MATEX concrete repair product if needed.
    2. Prime porous surfaces. On very porous or very dry substrates, prime with Megaseal Acryl thinned with 25% water. The product itself is ready to use; do not add water or any ingredient for the sealant coat.
    3. Mask and back. Fix masking tape to the sides of the joint to protect the edges, and make sure any joint filler or backing rod is tightly packed.
    4. Apply. Extrude the sealant directly into the joint with a manual caulking gun or spatula, ensuring full contact with the joint faces and avoiding air bubbles and gaps.
    5. Tool and clean. Smooth the sealant surface with a clean sponge wet with water. Clean tools with water before the material hardens.

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

    Standards & Test Methods

    StandardTitleReferenced for
    ASTM C920Standard Specification for Elastomeric Joint SealantsListed in the TDS
    ASTM D412Standard Test Methods for Vulcanized Rubber and Thermoplastic Elastomers—TensionElongation at break and modulus of elasticity

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

    Frequently Asked Questions

    What joints is Megaseal Acryl suitable for?

    Megaseal Acryl is for low movement joints: around door and window frames, skirting and architraves, construction joints, wall-to-ceiling joints and cracks in concrete. Maximum joint width is 10 mm and movement accommodation is +/- 10%.

    Can Megaseal Acryl be painted?

    Yes. Megaseal Acryl is paintable with emulsion and alkyd paints.

    How long does Megaseal Acryl take to cure?

    Megaseal Acryl cures by evaporation at approx. 1 mm per day at 25°C, depending on thickness and ambient temperature.

    Is Megaseal Acryl for interior or exterior use?

    The TDS describes Megaseal Acryl as a sealant and gap filler for interior use that is resistant to weathering. Application temperature is 10°C to 40°C and service temperature -5°C to +80°C.

    What packaging and shelf life does Megaseal Acryl have?

    Megaseal Acryl is supplied in 5 kg plastic containers, with a 12 month shelf life in unopened packing stored dry and below 35°C.

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