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Sikaflex
Sikaflex sealants offer advanced sealing and bonding solutions for demanding environments, including construction, roofing, marine, and transport. These sealants provide excellent adhesion on substrates such as concrete, wood, metal, and plastics, while remaining elastic under movement and weather stress. Designed for indoor and outdoor use, they are suitable for expansion joints, windows, doors, and industrial applications. With proven durability, Sikaflex ensures moisture resistance and long-term protection against the elements. Available in one-part polyurethane and hybrid systems, they’re trusted by professionals for sealing tasks that demand flexibility, strong bonding, and reliable performance in harsh or variable conditions.
Sikaflex 11 FC+
Sikaflex 11 FC+ (available as a pack of 12 x 300cc or 20 x 600cc cartridges) is a 1-part elastic joint sealant and multipurpose adhesive based on polyurethane that is suitable for indoor and outdoor applications. 1-part,ready to use Flexible and elastic Solvent free and odorless Very low emission Sealant: Bubble-free curing Very...
Sikaflex AT Connection
Sikaflex AT Connection (available in packs of 20 x 600cc sausages) is a universal construction sealant for connection joints that is a one part, solvent based, PU hybrid that is UV resistant and permanently elastic. Movement capability 25% (ISO 9047) - Silicone free and over-paintable Good weathering and aging resistance - Good adhesion...
Sikaflex Tank N
Sikaflex Tank N (available in packs of 20x 600cc sausages) is a 1-part elastic sealant for joints exposed to chemicals used in areas for the storage, filling and handling of water polluting liquids such as: Floor joints in petrol stations, joints in handling areas, storage tanks and containment bunds, etc. High chemical resistance High...
Sikaflex 221
Sikaflex 221 is a high quality multi-purpose non-sag 1 component polyurethane sealant that cures on exposure to atmospheric humidity to form a durable elastomer. 1 component formulation - Elastic - Low odour - Resistant to ageing Non-corrosive - Can be overpainted - Can be sanded Bonds well to a wide variety of substrates NSF approved...
Sikaflex PRO-3 SL
Sikaflex PRO-3 SL is a one part, moisture curing, self levelling elastic joint sealant with high mechanical resistance for indoor and outdoor floors. Applications include; movement and connection joints in floors, pedestrian and traffic areas (e. g. parking decks, car parks), warehouses and production areas. Movement capability of 25%...
Sikaflex 521 UV
Sikaflex 521 UV is a one-component PUR-Hybrid sealant based on the Sika Silane Terminated Polymer (STP) technology. The product cures on exposure to atmospheric humidity to form a durable elastomer. Ageing and weathering resistant Bonds well to a wide variety of substrates without the need for special pre-treatment Elastic - Can be...
Sikaflex 291i
Sikaflex 291i (available as a pack of 12 x 300cc cartridges) is a non-sag 1-part polyurethane sealant specifically developed for the marine market, which cures on exposure to atmospheric moisture and forms a durable elastomer. 1-part formulation Highly elastic Low odour Non-corrosive Can be over painted Bonds well to a wide variety of...
Sikaflex EBT+
Sikaflex EBT+ (box of 12x300ml cartridges) is a multi-purpose 1-part, elastic, polyurethane adhesive, sealant and filler. It bonds to all common building materials, is permanently elastic and has excellent grab and gap filling properties. Bonds to concrete, brick, mortar, wood, metals, glass, resins and most plastics. Features and Benefits...
Sikaflex-406 KC
Sikaflex-406 KC is a 1-part self-levelling booster accelerated elastic floor joint sealant with high mechanical and chemical resistance. Rapid and homogeneous curing throughout the entire sealant is achieved by the addition of the Sikaflex 406 KC Booster. Movement capability ±25 %. Low stress on joint edges. Very high mechanical and...
Sikaflex 406 KC Booster
Sikaflex-406 KC Booster is used with Sikaflex 406 KC to enable rapid and homogeneous curing throughout the entire sealant. Must be used with Sikaflex-406 KC Énables rapid release of areas to traffic, recessed and broadcast joints can be opened to traffic after only 3 hours (dependent on temperature) High joint movement capability of...
Sikaflex PRO-3 Purform
Sikaflex PRO-3 Purform is a 1-part, moisture curing, elastic polyurethane sealant. It seals many kinds of joint configurations in floors and civil engineering structures. The elasticity is maintained over a wide temperature range and high mechanical and chemical resistance provides good durability. Ideal for horizontal and vertical interior...
Sikaflex 403 Tank & Silo
Sikaflex 403 Tank and Silo is a 1-part, moisture curing, polyurethane elastic tank and silo sealant. Designed for sealing steel containers built in sections such as enamelled steel or stainless steel tanks Resistant to domestic and municipal sewage, liquid manure and silage liquid Good mechanical resistance Very good resistance to...
Sika SikaFlex 415
One-part polyurethane sealant. Ideal for construction joints, floor and wall joints, crack control in concrete, and general-purpose bonding in various settings. Offers excellent resistance to water, salt water, and weathering, ensuring long-term performance. Accommodates up to ±25% movement for structural flexibility. Ready-to-use...
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Sikaflex Sealants for Construction and Industry
Sikaflex products form part of an advanced range of flexible sealants used in structural glazing, cladding systems, and general construction. As a key solution for dynamic joints and high-movement applications, these materials bond strongly to substrates like concrete, metal, timber, and synthetic surfaces. Used from structural façades to wet room junctions, they provide UV stability, excellent elasticity, and superior adhesion. They’re also compatible with surfaces coated in interior paint, enabling seamless transitions across finished substrates indoors.
Engineered by Sika, these sealants are known for their performance across building, automotive, marine, and industrial sectors. From window frames to mechanical fixings and movement joints, Sikaflex cures to form watertight, weather-resistant seals that withstand temperature shifts and vibration. Rapid skin time, low shrinkage, and chemical resistance make them ideal for interior and exterior use, whether in residential upgrades or high-spec commercial installations.
Frequently Asked Questions
Can Sikaflex be used in constantly wet environments?
Yes, several Sikaflex products are suitable for wet environments, including roof joints, gutters, and submerged areas, depending on the product chosen. Always check the technical datasheet to confirm water immersion suitability. Some sealants are formulated to resist long-term water exposure without degrading or detaching, but proper surface preparation is essential for maximum adhesion. For frequently wet areas, avoid using paint over the sealant unless confirmed as compatible.
Can Sikaflex be sanded or painted after application?
Many Sikaflex sealants can be overpainted, but surface compatibility must be confirmed. Wait until the product is fully cured before sanding or painting, and perform a small test patch to check adhesion and finish. Flexible or water-based paints are often more compatible, whereas solvent-based coatings may crack or react poorly. Sanding should be gentle, and care must be taken not to damage the bond.
Do I need a primer before applying Sikaflex?
In most cases, Sikaflex adheres well without a primer, especially on clean, dry, non-porous surfaces. However, for porous materials like concrete, brick, or wood, or when maximum bond strength is required, Sika primers are recommended. These help to seal the substrate and ensure long-term performance. Check the substrate guide provided in the technical data to determine if priming is necessary.