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Sealants
Sealants play a key role in creating flexible, watertight, and airtight seals in construction, repair, and maintenance work. Suitable for expansion joints, window frames, service penetrations, and structural connections, these high-performance sealants bond to concrete, masonry, metal, plastic, wood, and glass for both indoor and outdoor use across all sectors. Choose from silicone, polyurethane, acrylic, and hybrid options for waterproofing, weatherproofing, structural movement, fire-stopping sealants, and general sealing. Ideal for wet rooms, façades, roofs, and more, many offer strong elasticity, are paintable, mould-resistant, and quick to cure - supporting both new builds and repair projects.
Fosroc Nitoseal MS60
One part, low modulus sealant based on hybrid silyl modified polyether (“MS”) technology. Suitable for use for sealing joints in concrete, brickwork, blockwork, perimeter sealing around doors and windows, and non-trafficked floor joints. Applied to joints between 5mm and 35mm wide For joint widths exceeding 35mm, please contact Rawlins...
Mapei Mapeflex PU45 FT Sealant
Mapei Mapeflex PU45 FT Sealant is a paintable, rapid, high modulus polyurethane sealant and adhesive, specially developed for sealing expansion and distribution joints in horizontal and vertical surfaces, including those which are subject to occasional chemical attack by hydrocarbons. From the 24th August 2023, adequate training is required...
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 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...
Sikasil WS 605 S
Sikasil WS 605 S (pack of 20x 600cc sausages) is a durable, neutral-curing silicone sealant with a high movement capability and excellent adhesion to a wide range of substrates. It can be used for weatherproofing and sealing applications where durability under severe conditions is required. It is particularly suited as a weather seal for...
Sika Plastix 22A Premium Grade Silicone Sealant
Sika Plastix 22A Premium Grade Silicone Sealant (Box of 12x 300ml cartridges) is a low modulus, neutral curing silicone sealant suitable for many construction and industrial applications but particularly suited for all glazing, façade and roofline applications. Features and Benefits Excellent primerless adhesion to all common building...
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Professional Sealants for Construction, Roofing, and Sanitary Applications – Silicone, Polyurethane & Acrylic
Sealants are essential building supplies for sealing joints, gaps, and protecting against moisture, air, and contaminants. Used across construction and refurbishment, they support structural movement and help prevent damage.
Options include sanitary, roofing, and structural sealants - ranging from polyurethane to silicone - for flexible, durable results in any setting. Available in various sizes, most are easy to apply, cure quickly, and resist UV, mould, or chemicals. Many products in this range are suitable for use with our range of accessories and building supplies. From bathrooms to façades, these products ensure clean, weatherproof finishes with lasting performance.
Sealants FAQs
Can sealants be painted over after application?
Some sealants, particularly acrylic and certain hybrid formulations, can be painted over once cured. However, many silicone sealants are not paintable and should be colour-matched at the time of application. Always check the product details and test paint compatibility if in doubt.
How do I prepare a joint before applying sealant?
Ensure the surface is clean, dry, and free from dust, grease, or loose material. Use a primer if specified, and insert a backer rod into deep joints to control the depth and shape of the sealant bead. Masking tape can be used along the edges for a clean finish and removed before the sealant skins over.
What does "low modulus" mean in sealant specifications?
"Low modulus" means the sealant requires less force to stretch and is typically more flexible, making it ideal for use in areas with movement or where joint expansion is expected. Low modulus sealants are often chosen for façades, cladding, and expansion joints in concrete or masonry structures.
Can sealants provide effective waterproofing?
Yes, many sealants offer excellent waterproofing. Silicone and polyurethane types are especially effective, forming flexible, watertight barriers that resist weather and moisture. They’re ideal for roofing, façades, and sanitary areas. Always check the product details to ensure it’s suitable for wet or exposed conditions.