Description
Sikaflex®-291 LOT is a one-component polyurethane marine adhesive sealant formulated with extended open time for applications requiring longer working periods. This moisture-curing, non-sag sealant is designed for elastic bonding and sealing in marine environments, making it suitable for tasks such as deck bedding and vibration-resistant joint sealing.
Key Features
- One-component polyurethane sealant with long open time for extended working applications
- Moisture-curing formulation for marine environments
- Non-sag consistency for vertical and overhead use
- Elastic and vibration-resistant sealing performance
- Bonds to a wide variety of marine construction substrates
- Suitable for above and below waterline applications
- Can be sanded and overpainted after curing
- Non-corrosive formulation for sensitive substrates
Technical Specifications
| Specification | Value |
|---|---|
| Chemical Base | 1-component polyurethane |
| Color | White, black, mahogany |
| Cure Mechanism | Moisture-curing |
| Density (uncured) | 1.46 kg/l |
| Application Temperature | 5 to 40 °C (41 to 104 °F) |
| Skin Time | 4 hours |
| Shore A Hardness | 45 |
| Tensile Strength | 1.3 MPa (190 psi) |
| Elongation at Break | 550% |
| Service Temperature | -40 to 90 °C (-40 to 194 °F) |
| Shelf Life | 12 months |
Compatible Substrates and Materials
- Wood
- Metals
- Metal primers
- Paint coatings (2-component systems)
- Fiberglass
Application Guidance
Surfaces must be clean, dry, and free from grease, oil, dust, and contaminants prior to application. Sikaflex®-291 LOT can be applied between 5 °C and 40 °C, with optimal performance between 15 °C and 25 °C. The extended skin time allows for longer working periods, making it suitable for larger assemblies such as decking installations. Apply using manual or powered dispensing equipment and complete tooling within the available skin time. Adhesion testing on actual substrates is recommended before full application.
Typical Use Cases
- Teak deck bedding and installation
- Marine joint sealing requiring extended working time
- Interior and exterior marine sealing applications
- Vibration-resistant sealing in boat construction
- General-purpose marine bonding and sealing
Target Industries and Buyers
- Boat builders and marine OEMs
- Shipyards and marine repair facilities
- Marine carpentry and decking installers
- Maintenance, repair, and operations (MRO) teams
- Industrial sealing professionals in marine environments
Performance Advantages
Compared to standard marine sealants, Sikaflex®-291 LOT provides extended open time, allowing for improved workability during larger or more complex assemblies. This makes it particularly useful for applications like deck installations where alignment and placement require additional time, while still delivering durable, elastic sealing performance in marine environments.
Common Questions
Q: What makes Sikaflex®-291 LOT different from standard versions?
A: It features a significantly longer skin time, allowing for extended working time during application.
Q: How long is the skin time?
A: The skin time is approximately 4 hours under standard conditions.
Q: Can it be used below the waterline?
A: Yes, it is suitable for both above and below waterline applications.
Q: What substrates does it bond to?
A: It bonds to common marine materials including wood, metals, coated surfaces, and fiberglass.
Q: Does it require mixing before use?
A: No, it is a one-component product and ready to use.
Q: Can it be painted or sanded after curing?
A: Yes, it can be both painted and sanded after curing.
Q: What is the recommended application temperature?
A: It should be applied between 5 °C and 40 °C (41 °F to 104 °F).
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