TDS SIS 440 Teak Deck Caulk

The Teakdecking Systems SIS 440 Teak Deck Caulk is the preferred choice for professional yacht builders, boatyards, marine service centers, and yacht owners who demand long-lasting performance from their teak deck seams. Developed specifically for the marine industry, this advanced neutral-cure silane polymer forms a tough, flexible rubber seal that protects your deck against water intrusion, UV exposure, saltwater, temperature fluctuations, and constant movement.

Unlike traditional polysulfide sealants, SIS 440 requires no primer on properly prepared seams, making installation faster while ensuring exceptional adhesion and durability. Once cured, it remains permanently flexible, allowing teak planks to naturally expand and contract without cracking or losing adhesion.

Whether you’re installing a new teak deck or restoring an existing one, SIS 440 provides the professional finish trusted on thousands of yachts worldwide.

Available Colours

Black

The classic choice for traditional teak decks. Black seams create the timeless contrast found on most luxury yachts and sailing vessels, delivering an authentic and elegant appearance.

White

Ideal for modern yacht designs, light-coloured teak, cork decking, or composite decks where a bright, clean seam is preferred. White offers the same professional performance as the black version while creating a contemporary deck aesthetic. White caulk should be allowed 15–21 days to fully cure before sanding.

Key Features

• Premium marine-grade teak deck caulk
• Available in Black and White
• One-component neutral-cure silane polymer
• No primer required on properly prepared seams
• Forms a durable, flexible rubber seal after curing
• Excellent adhesion to teak deck seam walls
• Outstanding UV resistance for long service life
• Highly resistant to saltwater, weather and marine chemicals
• Non-corrosive formulation suitable for marine substrates
• Minimal shrinkage and sag during application
• Maintains flexibility through temperature changes
• Professional-grade performance trusted by boat builders worldwide
• Suitable for new installations, repairs and complete deck re-caulking

Why Choose SIS 440?

A teak deck is constantly exposed to sun, seawater, rain and temperature changes. Inferior sealants can harden, crack or separate from the teak, allowing water to penetrate beneath the deck.

SIS 440 has been engineered specifically for these demanding conditions. Its advanced formulation remains flexible for years while maintaining a strong bond to the teak seam walls. This helps preserve the appearance of your deck and protects the underlying deck structure from water ingress.

Typical Applications

• Teak deck seam caulking
• Yacht deck restoration
• New teak deck installations
• Deck seam repairs
• Composite marine decking
• Cork marine decking
• Professional boatyard maintenance
• Superyachts, motor yachts and sailing yachts

Technical Specifications

Available Packaging

• 10.3 oz (305 ml) Cartridge
• 20 oz (592 ml) Sausage

Available in both Black and White.