Marine-Grade Consumables
Sikaflex 521 UV Adhesive & Sealant 300ml – Black
From £18.01£21.61
SKU: SIKA521UVB- Ageing and weathering-resistant: ideal for exposed marine and outdoor joints
- Matches black trim, dark hulls, rubber fittings and engine bay components
- Bonds to timber, metals, ceramics and plastics without special pre-treatment
- UV-stable polyurethane: a durable alternative to traditional marine silicone sealant
- Isocyanate- and solvent-free for professional use
| Quantity | Price |
|---|---|
| 1 - 4 | £18.01£21.61 |
| 5 - 9 | £16.21£19.45 |
| 10+ | £14.41£17.29 |
£18.01£21.61
Excl. VAT
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- Key Information
Sikaflex-521 UV in black is a one-component, UV-resistant polyurethane adhesive and sealant favoured by professionals where a discreet, colour-matched finish is needed alongside the durability of a true marine adhesive sealant. It's widely specified as a longer-lasting alternative to traditional marine silicone sealant, particularly for applications involving dark hulls, black trim, rubber fittings, and engine bay components where a white sealant would be visually obtrusive.
Sikaflex-521 UV adheres well to a wide variety of substrates without special pre-treatment, including timber, metals, metal primers and paint coatings (2-component systems), ceramic materials and plastics. It is suitable for elastic sealing and bonding in both internal and external applications. In marine use, the black formulation is typically chosen for deck seam bedding, dark-coloured hull-to-deck joints, porthole frames, and below-deck fittings where colour continuity matters. Its ageing and weathering resistance make it equally suited to automotive, industrial, and general construction use where non-marine bonding is required.
Isocyanate- and solvent-free, Sikaflex-521 UV offers a cleaner working environment. Seek manufacturer's advice and perform tests on original substrates before using Sikaflex-521 UV on materials prone to stress cracking. This product is suitable for experienced professional users only. Tests with actual substrates and conditions must be performed to ensure adhesion and material compatibility.
