Sika Sikaflex 521UV UV Resistant LM Polyurethane Sealant - 10.3oz(300ml) Cartridge - White

Sikaflex® 521UV UV Resistant LM Polyurethane Sealant - 10.3oz (300ml) Cartridge - White is a premium, UV-resistant, one-part silane-terminated polymer sealant ideal for marine and boating applications. It offers exceptional durability and elasticity, ensuring long-lasting, watertight seals in harsh marine environments.

Product Overview

Sikaflex® 521UV cures upon exposure to atmospheric moisture, forming a robust elastomer that bonds effectively to a wide range of substrates. Free from solvents and isocyanates, it provides a safe and reliable sealing solution for various components of your vessel.

Key Features & Advantages

Feature	Benefit
Low VOC/Solvent-Free	Environmentally friendly with reduced emissions.
Silicone and PVC-Free	Ensures compatibility with marine coatings and materials.
Isocyanate-Free	Safe for use without harmful chemicals.
High Electrical Resistance	Prevents electrical conductivity in sealed areas.
Excellent Weather and Ageing Resistance	Maintains integrity and appearance in harsh marine climates.

Applications in Marine & Boating

• Sealing joints and fittings on boats and yachts.
• Bonding to various substrates like wood, metals, plastics, and glass commonly found in marine vessels.
• Creating high-strength, elastic seals for decks, cabins, and other critical areas.
• Compatible with anodized aluminum, sheet steel, phosphated, chromated, and zinc-plated components.

Substrate Compatibility

Sikaflex® 521UV adheres effectively to a wide variety of materials without special pre-treatment, including:

• Wood
• Aluminum and anodized components
• Sheet metals (steel, phosphated, chromated, zinc-plated)
• Ceramic materials
• Plastics
• Glass
• Metal primers and two-part paint coatings

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 go to P65Warnings.ca.gov.

Download 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.