Sikaflex 591 Hybrid Marine Sealant

The Sikaflex 591 is a high-performance hybrid sealant designed for interior and exterior sealing applications on boats and yachts.

Its flexible formula absorbs vibrations and movement, providing long-lasting, watertight sealing even in demanding marine conditions.

It offers excellent resistance to sunlight, seawater and mold, while maintaining its colour over time.

Suitable for sealing joints and marine fittings, it bonds well to metals, painted surfaces, ceramics and other compatible materials.

It can be used for suitable applications above and below the waterline.

Technical Specifications

• Type: Hybrid marine adhesive sealant
• Material: Silane Terminated Polymer (STP)
• Formula: One-component, moisture-curing
• Properties: Flexible, water-resistant and mould-resistant
• UV Resistance: Excellent resistance to sunlight and weather conditions
• Adhesion: Metals, painted surfaces, ceramics and compatible plastics
• Skin Formation Time: Approximately 35 minutes
• Working Time: Approximately 20 minutes
• Application Temperature: +5°C to +40°C
• Service Temperature: -50°C to +80°C
• Shore A Hardness: 45
• Application: Interior and exterior marine sealing
• Available Packaging: 300ml cartridge and 600ml foil pack

Available Options

• 600ml – White
• 300ml – Black
• 300ml – White

Not suitable for teak deck joints or stress-cracking plastics such as PMMA and PC. Surfaces must be clean and dry before application.