Versatile Sealing Solution: Ideal for sealing and re-bedding a wide range of caravan and motorhome fittings, including overlap joints, awning rails, roof-lights, vents, and window surrounds.

Multi-Surface Compatibility: Perfect for use on aluminium mouldings, exterior lights, grab handles, and most external trims, ensuring a secure and long-lasting seal.

Durable & Weather-Resistant: Formulated to withstand outdoor conditions, this mastic sealing strip provides a reliable, weatherproof seal to protect against leaks and damage.

Easy to Apply: Convenient and simple to use, this sealing strip makes it easy to maintain and upgrade your caravan or motorhome fittings without the need for professional assistance.

High-Quality Performance: Trusted by caravan and motorhome owners, the W4 Mastic Sealing Strip delivers strong adhesion and lasting protection for all your external trims and fittings.

Versatile Sealing Solution: Ideal for sealing and re-bedding a wide range of caravan and motorhome fittings, including overlap joints, awning rails, roof-lights, vents, and window surrounds.

Multi-Surface Compatibility: Perfect for use on aluminium mouldings, exterior lights, grab handles, and most external trims, ensuring a secure and long-lasting seal.

Durable & Weather-Resistant: Formulated to withstand outdoor conditions, this mastic sealing strip provides a reliable, weatherproof seal to protect against leaks and damage.

Easy to Apply: Convenient and simple to use, this sealing strip makes it easy to maintain and upgrade your caravan or motorhome fittings without the need for professional assistance.

High-Quality Performance: Trusted by caravan and motorhome owners, the W4 Mastic Sealing Strip delivers strong adhesion and lasting protection for all your external trims and fittings.

𝐂𝐀𝐑𝐀𝐕𝐀𝐍 & 𝐌𝐎𝐓𝐎𝐑𝐇𝐎𝐌𝐄 𝐄𝐒𝐒𝐄𝐍𝐓𝐈𝐀𝐋 – Silicone- and solvent-free sealant that cures to a durable, UV- and weather-resistant finish. Includes a nozzle tip to help maintain freshness between applications.

𝐇𝐘𝐆𝐈𝐄𝐍𝐈𝐂 & 𝐋𝐎𝐍𝐆-𝐋𝐀𝐒𝐓𝐈𝐍𝐆 𝐅𝐈𝐍𝐈𝐒𝐇 – Specially formulated for use in areas with ventilation or air-conditioning, helping to maintain clean and fresh conditions.

𝐄𝐍𝐇𝐀𝐍𝐂𝐄𝐃 𝐂𝐎𝐋𝐎𝐔𝐑 𝐒𝐓𝐀𝐁𝐈𝐋𝐈𝐓𝐘 – Designed to withstand UV exposure and resist discoloration over time.

𝐒𝐔𝐈𝐓𝐀𝐁𝐋𝐄 𝐅𝐎𝐑 𝐊𝐈𝐓𝐂𝐇𝐄𝐍 & 𝐋𝐈𝐕𝐈𝐍𝐆 𝐀𝐑𝐄𝐀𝐒 – Safe for use in household environments, making it practical for spaces where cleanliness and durability are important.

𝐕𝐄𝐑𝐒𝐀𝐓𝐈𝐋𝐄 𝐈𝐍𝐓𝐄𝐑𝐈𝐎𝐑 & 𝐄𝐗𝐓𝐄𝐑𝐈𝐎𝐑 𝐔𝐒𝐄 – Ideal for flexible sealing and bonding on a wide range of surfaces, including wood, glass, metals, ceramics, plastics, painted surfaces, and more.

Versatile Sealing Solution: Ideal for sealing and re-bedding a wide range of caravan and motorhome fittings, including overlap joints, awning rails, roof-lights, vents, and window surrounds.

Multi-Surface Compatibility: Perfect for use on aluminium mouldings, exterior lights, grab handles, and most external trims, ensuring a secure and long-lasting seal.

Durable & Weather-Resistant: Formulated to withstand outdoor conditions, this mastic sealing strip provides a reliable, weatherproof seal to protect against leaks and damage.

Easy to Apply: Convenient and simple to use, this sealing strip makes it easy to maintain and upgrade your caravan or motorhome fittings without the need for professional assistance.

High-Quality Performance: Trusted by caravan and motorhome owners, the W4 Mastic Sealing Strip delivers strong adhesion and lasting protection for all your external trims and fittings.

VERSION Sikaflex-522 replaces Sikaflex-521 UV and Sikaflex-221i — 1 all-round product with even better properties.

PROPERTIES Weather-resistant, UV-stable, mildew resistant and aging resistant.

CAN BE USED INDOORS AND OUTDOORS For sealing external joints, windows, flaps, kitchenettes, sanitary areas on caravans and motorhomes. Also suitable for air conditioning and ventilation devices.

ADHESION TO COMMON SURFACES, e.g. wood, metals, primers and paints (2-K systems), ceramic materials and plastics, often without pretreatment.

SUITABLE IN THE FOOD SECTOR, EMISSION ARAM, CERTIFIED ISEGA certified, harmless to food regulations (e.g. sealing in the kitchen). EMICODE EC1PLUS certified, meets the highest EHS criteria (environment, health, safety). Meets hygiene requirements for air conditioning and ventilation systems according to VDI 6022. Sikaflex-522 is free of isocyanate, solvents, phthalate and silicones

Note The pictures shown indicate common traces that the production leaves behind. From our experience, it doesn't leak

THE CHOICE FOR CARAVAN AND MOTORHOME PROFESSIONAL REPAIRS – Silicone and solvent-free formula that cures to an impressive age, UV and weather-resistant finish.

CONTAINS HIGH FUNGICIDAL INGREDIENTS – Sikaflex -522 is suitable for areas where ventilation and air-conditioning are in place, and high hygiene is required to maintain healthy atmospheres preventing mould growth

IMPROVED COLOUR STABILITY – White sealant designed to resist the impact of UV rays and any associated discolouration.

.MEETS HYGIENE AND FOOD SAFETY REQUIREMENTS – Certified by ISEGA for use in areas where foodstuffs are prepared.

SUITABLE FOR INTERIOR AND EXTERIOR USE – Caravan sealant ideal for elastic sealing and bonding with substrates such as timber, glass, metals, ceramics, plastics, painted surfaces, and more.

All-Purpose Caravan Sealant Strip – Ideal for resealing and bedding overlap joints, awning rails, roof-lights, window surrounds, vents, and other exterior trims on caravans and motorhomes.

Strong Weatherproof Seal – Forms a flexible, weather-resistant barrier that protects against leaks and moisture ingress, perfect for long-lasting outdoor applications.

Wide Surface Compatibility – Adheres to most common materials including aluminum mouldings, plastic trims, external lights, and grab handles for maximum utility.

Quick, Mess-Free Application – Pre-formed strip allows for a clean, easy-to-control installation process – no curing time or professional tools required.

Various Sizes Available – Provides maximum coverage and sealing strength with a durable, off white finish that blends seamlessly with most exteriors.