Selleys N-Mastic Sealant Off White 410g – A non-skinning, non-hardening sealant for sealing joints and gaps.
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    Selleys

    Selleys N-Mastic Sealant – Off White – 410ml

    1 review|3 answered questions

    $11.40

    SKU: SNS41-22

    SKU: SNS41-22

    • Remains flexible: Stays pliable for long-lasting seals in dynamic joints.
    • Excellent adhesion: Bonds strongly to various common building materials.
    • Moisture resistant: Provides a reliable barrier against water and humidity.
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    Description

    Selleys N-Mastic Sealant - Off White - 410ml

    Selleys N-Mastic Sealant – Off White – 410ml is a polybutene-based non-skinning chemical. It will stay soft and paste-like indefinitely.

    Hidden lap connections between polymers, metals, wood, glass, masonry and expanded foam panels are sealed. Cool chambers, prefabricated construction, and gasket-sealed windscreens are used to prevent draughts and water infiltration through material gaps.

    Need alternatives? Look into our Sealant & Adhesive Range for more options.

    Key Features

    • Non-hardening – provides a long-lasting seal by remaining perpetually flexible.
    • Sticks to most substrates well.
    • Creates a strong barrier against water vapour transmission.

    How to Use

    1. Ensure surfaces are clean, dry, and free of dust, grease, or flaking paint before sealing.
    2. Use mineral turps to clean surfaces and let them dry.
    3. Cut the nozzle at an angle to the desired size, trim the cartridge nipple, attach the nozzle, and insert it into a caulking gun.
    4. Apply N-Mastic evenly using the caulking gun and smooth if needed.
    5. Secure joints with mechanical fixing where necessary.

    Limitations

    • Avoid use in exposed joints where dirt or hand contact may be an issue.
    • Not suitable for areas under significant movement or dynamic stress.
    • Not recommended for lap joints in mobile homes, truck bodies, or other areas with constant vibration and flexing.

    Handy Tips

    • For applications requiring high-pressure resistance, a curing sealant is a better option.

    Clean-Up

    Use mineral turps to clean spills and tools.

    Guides

    Safety Data Sheet
    Technical Data Sheet

    Specifications

    Size 410g Cartridge
    Colours Off White
    Technology Solvent Based
    Use (Interior) Yes

    Precautions

    • Keep away from heat, sparks, and flames.
    • Use in a well-ventilated area.
    • Avoid eye and skin contact.
    • Do not breathe vapors.
    • Do not ingest.
    • Keep out of reach of children.
    • Clean surfaces before application.
    • Store in a cool, dry place.
    • Dispose of properly.

    FAQ

    How should I store Selleys N-Mastic Sealant Off White?

    To maintain the quality and shelf life of Selleys N-Mastic Sealant Off White, store it in a cool, dry place away from direct sunlight. Ensure the cartridge is properly sealed when not in use to prevent contamination or drying out. Proper storage will help ensure the sealant remains effective and ready for use when needed.

    How do I prepare surfaces before applying Selleys N-Mastic Sealant Off White?

    Proper surface preparation is key to successful application. Ensure the surfaces are clean, dry, and free from any dust, grease, oil, or loose materials. Wipe the surfaces with a solvent-based cleaner like mineral turpentine and allow it to dry completely before applying the Selleys N-Mastic Sealant Off White.

    Can I paint over Selleys N-Mastic Sealant Off White?

    No, Selleys N-Mastic Sealant is not paintable. Due to its non-hardening and flexible nature, paint will likely crack and peel. If a paintable sealant is required, consider using a different type of sealant specifically designed for painting, like an acrylic or paintable silicone sealant.

    Looking for other related products? Browse our Building & Hardware Range for the available items.

    Additional information
    Weight .51 kg
    Sealants and Adhesives

    Sealants
    Brand

    Selleys
    Sealants

    Sealants

    Q & A

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    Selleys N-Mastic Sealant - Off White - 410ml Selleys N-Mastic Sealant - Off White - 410ml
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    Can this product be used to seal caravan roof joints? Catherine Kersnovske asked on 26 January 2025

    Yes, Selleys N-Mastic Sealant is suitable for sealing caravan roof joints as it is flexible and weather-resistant. Always ensure the surface is clean and dry before application, and refer to the product label for specific usage instructions.

     Ritchie Davos answered on 28 January 2025 store manager
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    Can this non-skinning mastic be used between a slab and the bottom plate to create a long lasting seal? Paul M asked on 3 January 2025

    Hi Paul, Yes, Selleys N-Mastic Sealant can be used between a slab and the bottom plate to create a long-lasting seal. It is designed for sealing concealed lap joints between various materials, including timber and masonry, and remains permanently flexible, making it suitable for this application.
    Just ensure that the surfaces are clean and dry before application for optimal adhesion. If you have any specific concerns about the installation or the conditions of your project, following best practices and relevant standards is recommended.

     Amelia answered on 10 January 2025 store manager
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    Is this product acidic Dennis asked on 17 February 2024

    Hey Dennis,
    No, Selleys N-mastic Sealant is not acidic

     Carl answered on 20 February 2024 store manager
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    1 review for Selleys N-Mastic Sealant – Off White – 410ml

    5.0
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    1. peter
      Verified owner

      A very good product at a very good price delivered on time.

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