SIKA
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Sikaflex 521, White, UV Resistant Low Modulus Sealant, 300ml Cartridge
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Sikaflex 521, White, UV Resistant Low Modulus Sealant, 300ml Cartridge
Sikaflex®-521 UV is a multi-purpose, UV resistant, non-sag, elastic, one-part silane-terminated polymer sealant, which cures on exposure to atmospheric moisture to form a durable elastomer.
Sikaflex 521, White, UV Resistant Low Modulus Sealant, 300ml Cartridge
Item #: 7113484

Sikaflex 521, White, UV Resistant Low Modulus Sealant, 300ml Cartridge

Item #: 7113484

AUD 62

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*All items will import from US

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Order now and get it around Saturday, September 12
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Sikaflex®-521 UV is a multi-purpose, UV resistant, non-sag, elastic, one-part silane-terminated polymer sealant, which cures on exposure to atmospheric moisture to form a durable elastomer.
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What Stands Out

UV Resistant
Sikaflex 521 offers exceptional UV resistance, ensuring long-lasting durability and preventing degradation caused by sunlight exposure, making it ideal for outdoor applications.
Low Modulus
The low modulus formulation allows for superior flexibility, accommodating building movement without cracking, ensuring a reliable, watertight seal in varied environments.
Versatile Use
Designed for multiple surfaces, Sikaflex 521 is perfect for construction and automotive applications, offering versatility that meets diverse sealing needs effortlessly.

Product Details

Shop for Sikaflex 521 white UV resistant low modulus sealant in a 300ml cartridge at Ubuy Australia. Order now to secure your project.
  • Multi-purpose UV resistant sealant
  • Solvent and isocyanate free
  • Non-sag and elastic
  • Cures on exposure to atmospheric moisture
  • Forms a durable elastomer
  • Bonds well to a wide variety of substrates
Brand NameSIKA
Unit Count10.1 Fluid Ounces
Global Trade Identification Number07612894448689
Number of Items1
Item Type NameGreat Product
ManufacturerSika
ModelSIKA-106096
Part Number106096
Item Weight16 ounces (453.6 grams)
Item Dimensions2 x 2 x 14 inches (5.1 x 5.1 x 35.6 cm)
Water Resistance LevelWaterproof
Item FormLiquid
Compatible MaterialWood, Metals, Sheet Steels, Metal Primers, Paint Coatings, Ceramic Materials, Plastics and Glass
Style NameCompact
ColorWhite
Material TypePolyurethane
MaterialPolyurethane
BrandSIKA
StyleCompact
Item dimensions L x W x H2 x 2 x 14 inches (5.1 x 5.1 x 35.6 cm)

Who Should Buy?

Suitable For
  • Outdoor Applications

    Ideal for sealing joints and gaps that are exposed to sunlight and weather elements, ensuring longevity.

  • Elastic Sealant Needs

    Perfect for applications requiring flexibility, adapting to movement without cracking or losing adhesion.

  • Marine Use

    Suitable for sealing boat joints and fittings, providing necessary water resistance and UV protection.

Not Suitable For
  • Heavy Structural Use

    Not suitable for load-bearing applications as it has a low modulus, limiting its structural integrity.

Product Description

Have any Query? Chat with us

Customer Questions & Answers

  • Question: What is Sikaflex 521 used for?

    Answer: Sikaflex 521 is a versatile low modulus sealant designed for various applications, including sealing windows, doors, and other substrates. Its UV-resistant properties make it ideal for outdoor use, ensuring that it withstands harsh weather conditions without deteriorating. Whether you're a DIY enthusiast or a professional contractor, Sikaflex 521 is perfect for projects requiring durable and flexible seals, providing long-lasting performance in both new constructions and repairs.
  • Question: Is Sikaflex 521 waterproof?

    Answer: Yes, Sikaflex 521 is waterproof, which makes it suitable for sealing joints and seams exposed to moisture. Its unique formulation allows it to maintain a strong bond even in wet conditions, preventing leaks and water infiltration. This quality makes it an excellent choice for use in bathrooms, kitchens, and exterior applications where water exposure is a concern.
  • Question: Can Sikaflex 521 be painted over?

    Answer: Indeed, Sikaflex 521 can be painted over once fully cured. This property allows for aesthetic versatility, enabling you to blend the sealant with the surrounding surfaces. To ensure the best adhesion, it is recommended to use compatible paints and to allow the sealant to cure completely before applying any paint. This makes it suitable for both functional and decorative applications.
  • Question: What type of surfaces does Sikaflex 521 adhere to?

    Answer: Sikaflex 521 adheres well to a variety of surfaces, including metals, glass, wood, and most plastics. This makes it an ideal choice for multi-material applications in construction and automotive contexts. Its strong adhesion ensures that it creates a long-lasting bond, which prevents air and water leakage. Users appreciate this versatility, especially in projects involving mixed materials.
  • Question: How does Sikaflex 521 perform in extreme temperatures?

    Answer: Sikaflex 521 performs well in a wide range of temperatures, maintaining its flexibility and bond strength even in extreme heat or cold. This resilience makes it suitable for applications in different climates, such as sealing exterior joints in cold regions or areas experiencing high heat exposure. Users can rely on its consistent performance, contributing to long-term durability.
  • Question: Is Sikaflex 521 suitable for auto applications?

    Answer: Yes, Sikaflex 521 is suitable for automotive applications, particularly for sealing and bonding windshields and other external components. Its low modulus allows for movement without cracking, which is essential for vehicles experiencing dynamic stresses. Automotive professionals often choose Sikaflex 521 due to its reliable performance in high-vibration environments.
  • Question: What is the curing time for Sikaflex 521?

    Answer: The curing time for Sikaflex 521 can vary based on environmental conditions such as temperature and humidity. Generally, it begins to skin over within a few hours, and full cure can take several days. It's important to ensure that the sealant is protected from moisture until fully cured. For best results, users should consult application instructions and consider the project timeline.
  • Question: Is Sikaflex 521 resistant to chemicals?

    Answer: Yes, Sikaflex 521 is resistant to a range of chemicals, including oils, fuels, and cleaning agents. This makes it an advantageous choice for industrial applications where exposure to such substances is likely. Its chemical resistance prolongs the life of the seal, making it suitable for use in environments that may challenge lesser sealants, thereby enhancing overall project durability.
  • Question: How do I apply Sikaflex 521 sealant?

    Answer: To apply Sikaflex 521 sealant, start by ensuring the surface is clean, dry, and free from contaminants. Use a caulking gun for precise application, and apply the sealant evenly into the joint or gap. Tool the sealant within the skin time for a smooth finish and optimal bonding. Proper application techniques will enhance adhesion and performance, ensuring long-lasting results in your project.
  • Question: Where can I buy Sikaflex 521, White, UV Resistant Low Modulus Sealant, 300ml Cartridge?

    Answer: You can buy Sikaflex 521, White, UV Resistant Low Modulus Sealant, 300ml Cartridge from Ubuy in Australia. Ubuy offers convenient shopping options, ensuring quick access to high-quality construction materials like Sikaflex 521, making it easier for you to find the right products for your projects.

SIKA Joint Sealants Editorial Review

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Customer Reviews & Ratings

18 customers ratings
  • 5 Star
    52%
  • 4 Star
    10%
  • 3 Star
    7%
  • 2 Star
    15%
  • 1 Star
    16%

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Pros

  • Excellent UV resistance
  • Flexible and durable sealant
  • Waterproof and weatherproof
  • Easy to apply with cartridge
  • Adheres well to multiple surfaces

Cons

  • Curing time can be slow

Platform Trust & Buyer Confidence

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4/5 294 reviews
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Chris
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“Promt delivery. Seems like a good product.”

22 July 2026 · via Trustpilot
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Scott
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“It was the best service ever received by any company from my online shopping experience in the last 10yrs”

11 July 2026 · via Trustpilot
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Terri
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“so easy to order delivery was way earlier than i expected”

3 July 2026 · via Trustpilot
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Gavin
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“Very impressed with the speed at which I received my package from the United States to Australia. Highly recommended.”

21-Jul-26 · via Trustpilot
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Jeannie
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“Very efficient service. Hassle-free. Excellent product. Have ordered several times.”

17-Jul-26 · via Trustpilot
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AUD 62

Order now and get it around Saturday, September 12

QTY:

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Features & Benefits

  • UV resistant sealant suitable for making high strength elastic seals
  • Applicable on wood, metals, ceramics, plastics and glass
  • Solvent, PVC and Silicone-free
  • Exposure to atmospheric moisture results in durable elastomer
  • Very low VOC
  • Highly resistant to aging and weathering

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