Selleys Marine Flex is a high-performance adhesive and sealant designed for marine and water-exposed applications. Using Sil-X advanced polymer technology, it provides a permanent watertight seal above and below the waterline, even in salt, fresh, or chlorinated water.
Key Features
Cures and bonds underwater
No primer required for most surfaces
Strong and flexible bond absorbs vibration and movement
Solvent-free and isocyanate-free formulation
Sandable once cured
10-year watertight seal guarantee (above waterline)
Where to Use
Ideal for marine, pool, spa, and construction projects where water exposure or movement is expected. Suitable for bonding and sealing:
Boat hulls, fittings, and deck seams
Pool tiles, coping, and skimmer boxes
Concrete, fibreglass, sealed timber, and metal surfaces
Glass, ceramics, and most rigid plastics
Technical Details
Technology
Sil-X advanced polymer
Colour
White or Black
Size
410g cartridge
Finish
Smooth, paintable once cured
How to Apply
Ensure surfaces are clean and free from grease, oil, or dust. Can be applied to damp or wet surfaces.
Cut the nozzle to the desired bead size and apply using a standard caulking gun.
Tool the sealant immediately with a soapy water solution before it begins to skin.
Allow to cure fully before sanding or painting if required.
Limitations
Not suitable for polyethylene (PE), polypropylene (PP), or PTFE materials
Gelcoat surfaces should be lightly sanded before application
The watertight guarantee applies to applications above the waterline
Why Choose Selleys Marine Flex
When you need a sealant that can withstand constant water exposure, movement, and vibration, Selleys Marine Flex delivers unmatched reliability. It bonds powerfully, stays flexible, and ensures a lasting waterproof finish for marine, pool, or construction applications.
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