Sika Sikaflex 221 Multi-Purpose Polyurethane Sealant/Adhesive - 10.3oz(300ml) Cartridge - Aluminum Gray

Sikaflex®-221 is a premium multi-purpose polyurethane sealant and adhesive designed specifically for marine and boating applications. Its superior bonding capabilities and durable elastomeric properties ensure long-lasting seals and strong adhesions in harsh marine environments.

Product Overview

Sikaflex®-221 is a high-performance, non-sag 1-component polyurethane sealant/adhesive that cures upon exposure to atmospheric humidity. It forms a flexible and resilient elastomer, making it ideal for a variety of marine and boating applications. This sealant meets ASTM C920 standards and is tested under ANSI/UL 723 for surface burning characteristics, ensuring both safety and reliability.

Key Features

Feature	Description
Elasticity & Durability	Highly elastic, maintaining flexibility and integrity over time even in extreme conditions.
Weather & Aging Resistance	Resistant to UV rays, moisture, and temperature fluctuations, ensuring long-term performance.
Non-Corrosive	Does not corrode metal substrates, protecting your marine equipment and structures.
Paintable & Sandable	Can be easily sanded and painted to match your vessel’s aesthetics.
NSF & UL Listed	Certified for potable water use and compliant with safety standards for various applications.

Applications

Sikaflex®-221 is versatile and bonds effectively to a wide range of substrates commonly found in marine settings:

• Wood
• Metals (including primed and painted surfaces)
• Ceramic materials
• Plastics

Ideal for creating permanent, elastic seals with high adhesive strength, Sikaflex®-221 is perfect for:

• Hull seams
• Deck fittings
• Bulkhead assemblies
• Window and door installations
• Engine mounts

Advantages

• Highly Elastic and Durable: Maintains flexibility and strength, accommodating movement and vibrations typical in marine environments.
• Resistant to Aging and Weathering Exposure: Withstands harsh marine conditions, including saltwater, UV exposure, and temperature extremes.
• Non-Corrosive: Protects metal surfaces from corrosion, extending the lifespan of your marine equipment.
• Can be Sanded and Overpainted: Facilitates seamless integration with your vessel’s design and finishing touches.
• NSF Registered: Safe for applications involving potable water in black, gray, and white formulations.
• UL Listed for Potable Water: Ensures compliance with safety standards for water-related applications.

Safety Information

WARNING: This product can expose you to chemicals which are known to the State of California to cause cancer, birth defects, or other reproductive harm. For more information, visit P65Warnings.ca.gov.

Additional Resources

For detailed application instructions and guidelines, please refer to the Quick Guide (PDF).

Orders of physical products placed by 3 PM EST M-F typically ships the same day, if all requested items are in stock. Weekend orders will typically ship on Monday.

Shipping takes 2-7 days.

We currently ship to the Contiguous 48 States.

Life of Sailing merch is custom made for the customer after an order is placed. Total turnaround is typically 7-14 days from order to doorstep.