MarineFlex high performance adhesive sealant can be used on boats, pools & spas, where you need a waterproof seal or bond, even under water* It can be applied & will cure under water – no need to drain your pool or spa. Compared to traditional polyurethanes it provides a more durable seal & bond with superior UV resistance.


  • Salt, fresh & chlorinated water (pools/spas)^
  • Above and below waterline
  • No primer required
  • Shock absorbing & vibration dampening
  • Solvent & isocyanate-free
  • Sandable when fully cured
  • Powered by Sil-X advanced polymer technology
  • 10 year water tight seal guarantee above the waterline**
  • *Critical seals/repairs underwater should be regularly checked and repaired if required. Not for polycarbonate and perspex underwater.
  • ^With typical levels of chlorination

Where can this product be used?

  • Suitable for boats, pools & spas^
  • ^With typical levels of chlorination 

What materials is this product suitable for?

  • Metals
  • Glass
  • Ceramic tiles
  • Sealed/painted timber & concrete
  • Fibreglass/FRP
  • GelcoatꚚ
  • Most plastics# (pre-test before use) 
  • #Not suitable for PP, PE or PTFE
  • ꚚGelcoat must be lightly sanded prior to product application


Please contact your store to confirm avaliability, as some stores may have a limited range.

Size 410g Cartridge
Colours White, Black
Technology Sil-X®
Use Exterior 
  1. Ensure substrates are clean and free of oil, grease or loose particles.  Can be used  on damp/wet surfaces.
  2. Porous surfaces like timber and concrete need to be painted/sealed first.
  3. Tool with a soapy solution before skinning occurs.
  4. See technical data sheet for more information


  • #Not suitable for PP, PE or PTFE
  • ꚚGelcoat must be lightly sanded prior to product application
  • Paintable with water-based paints once skinned. 
  • Some paints may require sealant to be lightly sanded before painting. 
  • Can be painted with solvent-based paint and epoxy and chlorinated rubber pool paint after first being painted with a water-based undercoat.

Refer to product label for full conditions. This guarantee does not limit and may not nesessarily exceed your rights under the Competitiion and Consumer Act 2010.

  • Uncured sealant can be removed with mineral turps.
  • Cured product can be removed by sanding and scraping.







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