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 premium, non-hardening joint sealant designed for long-lasting, flexible sealing in construction and maintenance projects. This polybutene-based, non-skinning compound remains permanently soft and paste-like, making it ideal for sealing concealed lap joints in a variety of building materials. Selleys N-Mastic Sealant – Off White – 410ml is trusted for its excellent adhesion, moisture resistance, and ability to maintain a reliable seal in both residential and commercial applications.

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

    Key Features

    • Permanently flexible and non-hardening for a lasting seal.

    • Excellent adhesion to most substrates, including plastics, metals, timber, glass, masonry, and foam panels.

    • Superior moisture resistance, providing an effective barrier against water vapour transmission.

    • Low shrinkage to prevent pulling away from joint surfaces.

    • Microbe resistant formula for enhanced durability.

    How to Use

    1. Ensure all surfaces are clean, dry, and free from dust, grease, or flaking paint. Clean with mineral turpentine or a similar degreasing solvent and allow to dry.

    2. Cut the nozzle at an angle to the desired size, trim the cartridge nipple, attach the nozzle, and insert into a caulking gun.

    3. Apply Selleys N-Mastic Sealant – Off White – 410ml evenly along the joint, smoothing if necessary.

    4. Mechanically fix joints where extra security is required.

    5. Clean up any excess sealant or spills with mineral turpentine or a cloth dampened with kerosene.

    6. Not suitable for exposed joints subject to dirt, hand contact, or significant movement.

    Guides

    Safety Data Sheet
    Technical Data Sheet

    Specifications

    Size 410ml Cartridge
    Colour Off White
    Technology Polybutene, Solvent Based
    Consistency Non-sag, paste-like
    Shrinkage ≤5%
    Service Temperature –40°C to +80°C
    Use Interior (concealed lap joints, various substrates)

    Precautions

    • Use Selleys N-Mastic Sealant – Off White – 410ml in a well-ventilated area.

    • Keep away from heat, sparks, and open flames; product is flammable.

    • Avoid contact with skin and eyes; wear suitable protective equipment.

    • Do not breathe vapours; use respiratory protection if ventilation is inadequate.

    • Not suitable for areas subject to constant vibration, dynamic stress, or where paintability is required.

    • Store in a cool, dry place, out of reach of children.

    • Dispose of empty cartridges and unused product according to local regulations.

    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 0.48 kg
    Dimensions 5.2 × 6.9 × 23.2 cm
    Sealants and Adhesives

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    Selleys
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    ALL Product Type

    Sealant

    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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