Polycote Rooflex Sealant is a high-performance, moisture-curing polymer sealant designed to provide a durable, flexible and watertight finish across a wide range of roofing substrates. Its advanced formulation bonds securely to materials including concrete, bitumen, metal, slate, brick and timber, making it ideal for sealing joints, cracks and holes prior to applying a roof coating system. Once cured, it delivers a resilient, UV-stable barrier that withstands weathering and movement without degrading.
Supplied in an easy-to-use 380 ml cartridge, Rooflex Sealant offers excellent workability and rapid skin formation, helping you achieve a clean, reliable seal with minimal downtime. Its strong adhesion and long-term flexibility ensure lasting protection in demanding environments, providing an essential preparation step for achieving a robust and waterproof roof surface.
Note: this product has a best before date of March 2026 and is priced to reflect this. We advise this product is still perfectly usable for up to 6 months after this date. We do not accept returns on this product after March 2026.
Rooflex Sealant is a gun applied repair compound. This polyurethane roof and joint sealing compound has outstanding resistance to weathering and joint movement.
Use on:Asphalt, bitumen, felt, asbestos, concrete, roofing tiles, slate, brick, stone, cast iron, galvanised steel, aluminium, lead, zinc, glass and timber
Use where:External repairs to joints, gaps, cracks and holes prior to coating
Coverage:Joint size 6mm x 6mm – 380ml Cartridge will cover 21.1m
Cure time:20 minutes @ 20oC/65% relative humidity, Rooflex Sealant will form a tack-free skin after and cure at a rate of 2mm per 24 hours.
Special features:Excellent adhesion, extra flexibility, UV resistance, waterproof
Application temperature:5oC to 35oC
Number of parts supplied:1
Priming required:Seal porous surfaces with Rooflex Primer first to prepare the surface and to improve adherence and coverage
Please consult the technical data sheet for full technical product data.
Preparation:
Thorough joint preparation is essential.
For optimum joint movement accommodation, the joint must be NOT LESS THAN 6mm wide. Narrower joints and cracks subject to movement must therefore be raked out and opened out to this minimum size. The prepared surface should be dry, clean, sound and free of flaking or loose material, moss or fungal growth. Any previous joint sealant material should be removed.Porous surfaces should be sealed with SP Primer before applying Rooflex Sealant.
Priming:
A single coat of SP Primer should be applied if appropriate using a clean dry brush and allowed to dry for 60 minutes. Rooflex Sealant should then be applied as soon as possible and in any case within 8 hours.
Application:
Apply using a caulking gun. Cut the nozzle at an angle to facilitate the placing of the sealant.
