Sikaflex 291i sealant

  • For interior and under water
  • 1-component sealant
  • For yacht and ship building

Adhesive and sealant exclusively for interiors and below the waterline.

Sikaflex 291i is a non-sag 1-component poly-urethane sealant which was specially developed for for yachts and shipbuilding. The 1-component polyurethane sealant has good standing ability and low VOC content. Sikaflex 291i cures  on exposure to atmospheric moisture and meets the low spread of flame requirements set out by the International Maritime Organisation (IMO). 

Benefits of Sikaflex 291i

  • Wheelmark certified.
  • 1-component formulation.
  • Highly elastic.
  • Low odour.
  • Non-corrosive.
  • Can be painted. 
  • Bonds well to a wide range of marine substrates.
  • Solvent-free.
  • Very low VOC content.
  • Low isocyanate content.


This multifunctional Sikaflex is widely used in yachtbuilding and shipbuilding. The sealant is suitable for making elastic, vibration-resistant joint seals and can be used in various interior sealing and adhesive applications. Sika Sikaflex 291i adheres very well to materials commonly used in yacht and shipbuilding structures. For example, this product has a very good adhesion to wood, metals, metal primers, 2-component system coatings, ceramic materials and plastics (e.g. polyester). This product is only suitable for use by experienced professionals. Always carry out tests in advance on common substrates and under local conditions to determine adhesion and material compatibility.

Please note: Sikaflex 291i should not be used for sealing stress-corrosion-sensitive plastics (e.g. PMMA, PC, etc). Use Sikaflex 295UV for this purpose.


Chemical base: 1-component polyurethane
white, grey, black, brown
Cure mechanism:
Non-sag properties:
Application temperature: 
Skin time:
60 minutes
Open time:
45 minutes
Shore A hardness:
Shelf life:
12 months, storage below 25°C

Tube 70 ml white
Tube 70 ml black
Tube 300 ml white
Tube 300 ml black
Tube 300 ml grey
Tube 300 ml brown

For all technical properties, see the technical documentation.

We have a number of recommendations for working safely with polymers. At Polyestershoppen you will not only find the polymers themselves, but you can also purchase all the protective equipment you need from us. If you have any doubts or questions, please contact our customer service. We can give you advice on how to work safely with polymers.

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