Sika Sikaflex 521 UV Adhesive Weather Mastic Sealant


Specially formulated as a Multipurpose Adhesive Sealant for use in & around areas such as Caravan Motor Home Boat Solar Panel Mounting Wood & Metal Fixing.

Sikaflex®-521 UV is a multi-pur-pose non-sag elastic one compo-nent sealant based on a polyure-thane-hybrid compound, which cures on exposure to atmospheric humidity to form a durable elas-tomer.

Sikaflex®-521 UV is manufactured in accordance with ISO 9001 / 14001 quality assurance system and with the responsible care program.

Product Benefits

1-C hybrid formulation


Ageing and weathering resistant

Bonds well to a wide variety of substrates without the need for special pre-treatment

Can be overpainted

Can be sanded

Low odour


High electrical resistance

VOC and solvent-free

Silicone- and PVC-free

Areas of Application


®-521 UV adheres well to a wide variety of substrates and is suitable for elastic sealing and bonding. Suitable substrate mate-rials include timber, metals, metal primers and paint coatings (2-part systems), ceramic materials and plastics.

Seek manufacturer’s advice before using on transparent materials that are prone to stress cracking.

This product is suitable for pro-fessional experienced users only. Tests with actual substrates and conditions have to be performed to ensure adhesion and material compatibility.

Price Information

The following prices are based on order quantity.
Quantity OrderedPrice per Tube
1 - 11£14.33 (inc VAT)
12 or more£12.66 (inc VAT)
Image Code Description Brand EAN Size Colour Price Quantity
SIK2963 Sika Sikaflex 521 UV Caravan Sealant 300ml Black Sika 7612894141818 300ml Black £14.33 (inc VAT)