Sikaflex®-291 is a non-sag 1-component polyurethane sealant specifically developed for the marine market, which cures on exposure to atmospheric moisture.

It is a multipurpose product for use in marine constructions, suitable to make elastic, vibration-resistant joint seals, and can also be used for a variety of interior sealing applications.

Sikaflex®-291 bonds 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.).

However, Sikaflex®-291 must not be used to seal plastics that are prone to stress cracking (e.g. Plexiglas, Polycarbonate, etc.).

Once cured, Sikaflex®-291 can easily be sanded as required.

Preparations:

• Surfaces must be clean, dry and free from grease, oil and dust. Surface treatment depends on the specific nature of the substrates and is crucial for a long lasting bond.

Applications:

• Sikaflex®-291 can be processed between 5 °C and 40 °C (41 °F and 104°F), but changes in reactivity and application properties have to be considered. The optimum temperature for substrate and sealant is between 15 °C and 25 °C (59 °F and 77 °F).
• It can be processed with manual, pneumatic or electric driven piston guns.