Sikaflex®-291i is a non-sag 1-C polyurethane sealant specifically developed for the marine market, which cures on exposure to atmospheric moisture and forms a durable elastomer. Sikaflex®-291i meets in addition the low spread of flame requirements set out by the International Maritime Organisation (IMO).
Sikaflex®-291i is manufactured in accordance with the ISO 9001 / 14001 quality assurance system and with the responsible care program.
- Wheelmark approved
- 1-C formulation
- Highly elastic
- Low odour
- Can be over painted
- Bonds well to a wide variety of marine substrates
- VOC and emission free
Areas of Application
Sikaflex®-291i is a multipurpose product used in marine constructions.
It is suitable for making elastic, vibration-resistant joint seals, and can also be used for a variety of interior and exterior sealing applications. Sikaflex®-291i bonds extremely well to the materials
commonly used in marine construction like wood, metals, metal primers and paint coatings (2-C systems), ceramic materials and plastics (GRP, etc.). Sikaflex®-291i must not be used to seal plastics that are prone to stress cracking (e.g. PMMA, PC, etc.).
This product is suitable for experienced professional users only.
Test with actual substrates and conditions have to be performed to ensure adhesion and material
Sikaflex®-291i is resistant to fresh water, seawater, limewater, sewage effluent, diluted acids and caustic solutions; temporarily resistant to fuels, mineral oils, vegetable and animal fats and oils;
not resistant to organic acids, alcohol, concentrated mineral acids and caustic solutions or solvents.
The above information is offered for general guidance only. Advice on specific applications will be given on request.
Method of Application
Surfaces must be clean, dry and free from grease, oil and dust. The adhesion of the sealant can be improved by wiping the joint with an appropriate Sika® activating agent and Sika® Primer if required.
Advice on specific applications is available from the Technical Service
Department of Sika Industry.
Cut off the tip of the nozzle to suit joint width and apply the sealant with a suitable hand operated or compressed-air gun, taking care to avoid air entrapment.
Do not apply at temperatures below 10°C or above 40°C. The optimum temperature for substrate and sealant is between 15°C and 25°C.
Tooling and finishing
Tooling and finishing must be carried out within the tack-free time of the sealant. We recommend the
use of Sika® Tooling Agent N.Other finishing agents or lubricantsmust be tested for suitability / compatibility.
Uncured Sikaflex®-291i can be removed from tools and equipment with Sika® Remover-208 or another
suitable solvent. Once cured, the material can only be removed mechanically.
Hands and exposed skin should be washed immediately using Sika® Handclean towels or a suitable industrial hand cleanser and water. Do not use solvents!
It is generally not recommended that a finish such as a paint or varnish is applied because solvents or plasticisers can adversely affect the cured
Sikaflex®-291i or the drying of the film.
Varnishes or paints do not often exhibit the flexible characteristics of the sealant which could lead to unsightly cracks in the finish.
Any paint or varnish used must be tested for compatibility by carrying out preliminary trials on the fully cured sealant.
One pack paints or paints that dry by oxidation (oil or alkyd resin based) are generally not suitable for application over Sikaflex®-291i and two pack paint systems are preferred.
Pack 300 ml. Color: black.