Description
Sikaflex 291 LOT Black Adhesive Sealant | Boat Supply Store
For complex marine bonding and sealing projects requiring extended manipulation time, Sikaflex® 291 LOT provides a significantly longer open time than standard formulations, allowing for precise positioning and adjustment. This 1-component, moisture-cured polyurethane elastomeric sealant is suitable for use both above and below the waterline, maintaining excellent bond strength and saltwater resistance. With NSF approval for potable water applications and USDA approval for incidental food contact, it ensures safe and durable performance in diverse marine environments, from deck fittings on a Bertram to hull penetrations on a shallow draft skiff.
Key Features
- Extended working time with slow cure formulation
- Marine-grade performance above and below the waterline
- Durable and permanently elastic polyurethane construction
- Saltwater resistant for coastal and offshore use
- Paintable and sandable for a finished appearance
- Potable water NSF approved
- Incidental food contact USDA approved
- Non-sag system for vertical and overhead applications
Specifications
| Product Specifications | |
|---|---|
| Product Type | 1-component, moisture-cured polyurethane adhesive and sealant |
| Cure Type | Slow Cure |
| Color | Black |
| Container Size | 10.3oz (300ml) Cartridge |
| Application | Above and below waterline |
| Resistance | Saltwater resistant |
| Post-cure Properties | Paintable, sandable, permanently elastic |
| Approvals | NSF approved for potable water, USDA approved for incidental food contact |
Who This Is For
Ideal for marine professionals and DIY enthusiasts undertaking projects that demand extended working time for precise alignment and complex installations. This sealant is particularly beneficial for those working in challenging environmental conditions such as high humidity or elevated temperatures, where standard cure times are insufficient.
How It Compares
| Feature | Sikaflex 291 LOT Black Adhesive Sealant | Competitor |
|---|---|---|
| Open Time | Long Open Time (designed for more time) | 30-45 minutes |
| Cure Type | Slow Cure | Fast Cure |
| Waterline Use | Above and Below | Above and Below |
| Potable Water Approval | NSF Approved | Not Approved |
Common Concerns Answered
Is the longer cure time a problem for quick repairs?
While Sikaflex® 291 LOT offers an extended open time for complex adjustments, it does mean a longer initial cure phase compared to faster-setting sealants. For urgent repairs where immediate structural integrity is paramount, alternative products might be considered, but its specific formulation is designed for applications where precision and adaptability are key.
Is Sikaflex® 291 LOT more expensive than other sealants?
The price point reflects its specialized formulation, including the extended open time and dual NSF/USDA approvals, which are not found in basic sealants. This premium performance ensures superior adhesion, flexibility, and suitability for critical applications where standard products may not suffice.
What happens if Sikaflex® 291 LOT is applied messily?
Careful application with a standard caulking gun and adherence to proper surface preparation protocols will minimize mess. Excess uncured material can typically be removed with a clean cloth and appropriate solvent, while cured material may require scraping or sanding.
Frequently Asked Questions
What is Sikaflex® 291 LOT used for?
Sikaflex® 291 LOT is utilized as a high-strength, flexible adhesive and sealant in numerous marine applications, including bedding deck hardware, sealing hull and deck joints, mounting components, and creating watertight seals both above and below the waterline. Its slow cure is ideal for bonding large components or in challenging temperature and humidity conditions.
Can Sikaflex® 291 LOT be used above and below the waterline?
Yes, Sikaflex® 291 LOT is specifically formulated for reliable performance in both above and below the waterline marine environments, maintaining its integrity and adhesion in constant immersion and exposure to saltwater.
Is Sikaflex® 291 LOT paintable and sandable?
Yes, once fully cured, Sikaflex® 291 LOT can be painted over and sanded, allowing for seamless integration with surrounding surfaces and a custom finish.
What is the open time for Sikaflex® 291 LOT?
Sikaflex® 291 LOT offers a significantly longer open time than standard Sikaflex® 291, designed to provide ample working time for positioning, adjustment, and application, especially beneficial in humid or high-temperature conditions.
Is Sikaflex® 291 LOT suitable for potable water applications?
Yes, Sikaflex® 291 LOT holds NSF approval for potable water applications, making it suitable for use in systems that come into contact with drinking water on vessels.
