Teakdecking Systems 10oz Marine Caulk Cartridge - Premium Quality - SIS440 - Marine Sealant for Teak Deck Seams - Provides First Class Appearance - UV & Chemical Resistant, Non-Corrosive (White)

SIS440 Caulk is the proven leader in the marine industry and was developed specifically for teak deck seams. It is a one-part, paste-like neutral cure formulation and when exposed to moisture in the air, it reacts to form a tough, flexible solid rubber compound. The sealant does not sag during cure, and has excellent temperature stability and chemical resistance once cured. Because the sealant is neutral cure, it is non-corrosive to all substrates and will not damage the surrounding environment or structures. Caulk is easy to sand and will not clog sandpaper. Sanding with a fine 100 or 120 grit sandpaper is recommended. White caulk will shrink somewhat when applied. To avoid having low seams, it is recommended that 1 or 2mm extra caulking is left above a fresh seam.Store in a dry area at temperatures above 32°F (0°C) and below 80°F (26°C). Do not expose to direct sunlight, extreme heat, or freezing. The sealant has a shelf life of 18 months from manufacture date. See “BEST USED BY” date on packaging. Not designed for use under the waterline.Other Applications:- Bedding deck equipment/hardware- Bedding parts (steps, pads, etc.)- Caulk seams in other wood decks- Edges around sealed windows- ConstructionAbout TDS SIS440 Caulk:More than 50,000 decks manufactured and installed in 35 years; 166 miles (267 km) of caulked seams per year. Well-tested and proven in hot or cold climates. Used by boat builders, boat repair yards, marinas, private boat owners, cruise ships, and ship chandleries.

• HIGH-QUALITY MARINE POLYMER — 10oz cartridge of black waterproof caulk made with a one-part silane polymer that forms a solid rubber compound. Our marine caulking for boats offers the highest rated UV resistance, excellent chemical resistance, superior temperature stability, and easy sanding to improve project turnover time.
• FLEXIBLE & PRIMER-FREE — Thixotropic paste that won’t drip or sag and is easy to work with thanks to its long-lasting flexibility. One-step, primer-free application saves time, contains no solvents, is environmentally friendly, and creates a safer work environment with less waste and more economical usage.
• FIRST-CLASS APPEARANCE — Our marine caulking sealant is designed for seams 3–10mm wide to produce a first-class finish. Seam depth should match or exceed width, with caulk filling the full bottom of the seam. Bond-breaker tape is recommended for seams 5mm (3/16”) or deeper, and properly filled full-depth seams help extend teak deck life.
• CURE TIME — This marine grade sealant cures to deliver better adhesion, longevity, and appearance compared to polysulfide, polyurethane, and MS polymers. Black caulk is ready for sanding after at least 48 hours at 68°F (20°C) based on ¼” x ¼” (6.4mm x 6.4mm) seams; larger seams may require additional curing time.
• PROPERTIES — Available in black, white & gray with an 18-month shelf life from the date of manufacture (printed on the bottle). Meets Federal Specifications and ASTM C920, and is manufactured in an ISO 9001 certified facility.