Waterproof Coating

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Nippon Paint NP789 PU Waterproof Rooftop Coat

Nippon Paint NP789 PU Waterproof Rooftop Coat

Nippon Paint NP789 PU Waterproof Rooftop Coat is a single-component waterproofing top coating which is formulated from environmentally friendly water-based PU emulsion, functional fillers, and additives. This product is specifically developed for the humid environment of Hong Kong, featuring durable waterproof performance, high elasticity for crack resistance, weather resistance, low water absorption rate, and compliance with water-based environmental standards. It is suitable for waterproofing applications both indoors and outdoors.

Application Areas:
• Waterproofing for new and renovated projects: Suitable for various concrete roofs, including both flat and sloped surfaces.
• Ideal for waterproofing the roofs of village houses, providing a durable surface for foot traffic.
• Applicable for waterproofing various wall surfaces, including parapet walls and external walls.
• Suitable for flooring in kitchens, bathrooms, terraces, and other indoor spaces.
• Suitable for use in pools.

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Features

• The polyurethane component is tougher than acrylics, offering enhanced durability in waterproofing and crack resistance with an extended service life.
• High Elasticity: Specifically designed to endure various outdoor temperature fluctuations, effectively resisting contraction and expansion for long-lasting durability.
• Excellent Weather Resistance: Successfully tested for artificial climate aging for over 2,500 hours, ensuring sustained performance against UV exposure.
• Chemical Resistance to acids, alkalis, and other chemicals.
• Ready to Use: Convenient to apply, suitable for both roller and brush applications.
• Water-based and environmental friendly, ensuring safety.

    Reference

    Coverage: For a 1.0mm thick layer, the usage is approximately 1.5 kg/㎡/layer (Consumption may vary depending on the substrate condition and coating thickness).
    No of coat Recommended: 2 - 3 layers
    Diluent: No dilution is necessary.
    Overcoat Time: 2 – 6 hours (25ºC)
    Drying Time: 48 – 72 hours (25ºC)
    Packing: 5kg, 20kg
    Colour: White, Grey

    Usage Instructions:
    [Substrate Preparation]
    • Substrate Inspection: Before construction, ensure that the substrate is solid, free of oil stains and other loose materials, and that the surface dust is thoroughly cleaned. Visible holes and cracks should be repaired using a mortar mix first. For loose substrates, remove the loose materials before proceeding with repairs and leveling.
    • Moisten the Substrate: Fully moisten the substrate with clean water, and allow it to dry until there is no obvious residual moisture before starting the application.

    【Waterproofing Application】
    • Mix thoroughly before Use. No dilution is necessary.
    • Reinforcement Treatment: It is recommended to apply 1-2 layers of Nippon Paint Waterproof Polymer Coating first to seal fine cracks and holes.
    • Waterproofing requires two or more layers, and the next layer should be applied only after the previous one has completely dried. The application can be done using a cross-covering method, with an interval of about 6-8 hours. The temperature, humidity, and ventilation conditions at the construction site will directly affect the drying time of the waterproof layer.
    • The thickness of each layer should be controlled between 0.5 mm and 1.0 mm, with a total waterproof thickness of at least 1.5 mm. Apply evenly, avoiding excessive thickness in a single application.
    • If a water tightness test is required, it should be conducted only after the coating has completely dried (approximately 2-3 days at 23°C and 50% humidity; longer drying times are needed in low-temperature and high-humidity environments).

    *The information given applies to the product and its performance under specific test conditions. The actual data may vary slightly depending on the application conditions, methods, and surface conditions.

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