What is BOSTIK DECK CAULK S GREY and why choose it?
BOSTIK DECK CAULK S GREY is a one-component, permanently elastic silicone polymer sealant developed specifically for caulking teak decks and other deck materials in yacht and boat construction. It cures quickly with ambient moisture, delivers long-lasting watertight joints and can be sanded after curing for a perfectly smooth, flush deck finish.
Thanks to its excellent resistance to UV, weather, fresh and salt water and many chemicals, DECK CAULK S GREY is designed to withstand demanding marine environments while remaining solvent- and isocyanate-free.
Main features
- Marine-grade teak deck caulk for watertight sealing of joints on teak and other deck materials.
- One-component, moisture-curing silicone polymer – easy to extrude with manual or pneumatic gun.
- Permanently elastic to accommodate deck movements caused by temperature and humidity changes.
- Can be sanded after curing for a flush, visually clean deck surface.
- Excellent UV and weather resistance, suitable for long-term outdoor and marine exposure.
- Resistant to fresh and salt water, ideal for yachts and other vessels.
- High chemical resistance for demanding service environments.
- Solvent- and isocyanate-free formulation.
- Quick skin formation to reduce dust pick-up on open decks.
- Available in grey for visually discreet teak deck seams.
Technical specifications
- Chemical base: Silicone polymer
- Colour: Grey
- Specific density: approx. 1.3 g/ml
- Skin formation time: approx. 10 minutes (23°C / 50% RH)
- Curing mechanism: Moisture
- Curing speed: approx. 2–3 mm (23°C / 50% RH)
- Shore A hardness: approx. 26
- Tensile stress at 100% elongation: approx. 0.5 MPa (ISO 37, dumbbell specimens)
- Tensile strength at break: approx. 1.3 MPa (ISO 37, dumbbell specimens)
- Elongation at break: approx. 475% (ISO 37, dumbbell specimens)
- Shear strength: approx. 1.0 MPa (ISO 4587)
- Temperature resistance in service: -40°C to +110°C*
*10 cycles of 7 h at 110°C followed by 17 h at 23°C / 50% RH.
- Application temperature (substrate/ambient): +5°C to +40°C
- UV and weather resistance: Excellent
- Recommended minimum adhesive thickness: 2 mm
- Recommended joint geometry (teak decks): depth ≈ width, minimum 5 mm (for joint widths < 10 mm)
- Packaging: 290 ml cartridge; 600 ml sausage; 200 l drum
- Shelf life: 18 months (cartridge); 12 months (sausage) in unopened original packaging, stored dry at +5°C to +25°C
Applications and use cases
Primary applications
- Watertight sealing of joints in teak decks on yachts and boats.
- Sealing joints in other deck materials within the marine and yacht construction industry.
Substrate preparation and application overview
For detailed procedures, refer to the bonding and caulking of teak decks application manual. Key points include:
- Ensure all bonding and joint surfaces are clean, dry and free from grease and dust.
- Clean teak with Bostik / Simson Cleaner E and allow to dry (typical minimum 5 minutes).
- For teak joints, pretreat seam sides with Simson Prep P and respect specified drying times.
- Use bond breaking tape at the bottom of deeper seams to prevent three-side adhesion.
- Extrude BOSTIK DECK CAULK S GREY with a manual or pneumatic gun within the application temperature range of +5°C to +35°C / +40°C.
- Fill seams from bottom to top, pulling the nozzle at a constant speed and applying 10–20% surplus material.
- Within approx. 15 minutes (at 23°C / 50% RH), smooth the sealant using a spatula or putty knife lightly moistened with soapy water. Avoid letting the soapy solution enter between joint faces and sealant.
- Clean tools and uncured residue with a clean, lint-free cloth moistened with Bostik Liquid 1 or Bostik Cleaner E.
- After full cure (typically 3–7 days for teak deck seams, depending on joint size, temperature and humidity), the deck caulk can be sanded flush along the grain using progressive grits (e.g. 80 then 120).
Typical use cases
- New-build teak decks on sailing yachts, motor yachts and commercial vessels.
- Refurbishment and re-caulking of existing teak decks, after complete removal of old sealant.
- Sealing decorative or functional deck joints where long-term elasticity and UV stability are required.
FAQ
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1. What is the main use of BOSTIK DECK CAULK S GREY?
It is designed for watertight sealing of joints in teak and other deck materials in yacht and boat construction.
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2. Can the sealant be sanded?
Yes. After full curing, the product can be sanded to obtain a smooth, flush deck surface.
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3. Is it suitable for marine environments with UV and salt water exposure?
Yes. It offers excellent resistance to UV radiation, weathering, and both fresh and salt water.
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4. What joint dimensions are recommended for teak decks?
As a general guideline for joint widths below 10 mm, a depth-to-width ratio of 1:1 is recommended, with minimum 5 mm width and depth.
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5. Which temperatures are recommended for application?
The product should be applied between approximately +5°C and +40°C. It can be extruded easily between +5°C and +35°C.
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6. How long does it take to form a skin?
Skin formation time is approximately 10 minutes at 23°C and 50% relative humidity.
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7. How should tools be cleaned after use?
Uncured material can be removed with a clean, colourfast cloth moistened with Bostik Liquid 1 or Bostik Cleaner E. Cured material must be removed mechanically.
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8. What is the shelf life and storage condition?
In unopened original packaging, shelf life is 18 months for cartridges and 12 months for sausages, when stored dry between +5°C and +25°C.
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9. Is the formulation solvent- and isocyanate-free?
Yes. The product is free from solvents and isocyanates.
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10. Where can I find additional detailed technical information?
Consultar ficha técnica del fabricante.
Section 14 – Transport information
Based on the safety documentation for the MSR Deck Caulk range:
- Land transport (ADR/RID): Not regulated; no UN number; no assigned transport hazard class; no packing group; not classified as environmentally hazardous; no special provisions.
- Sea transport (IMDG): Not regulated; no UN number; no transport hazard class; no packing group; not a marine pollutant (NP); no special provisions.
- Air transport (ICAO-TI / IATA-DGR): Not regulated; no UN number; no transport hazard class; no packing group; not classified as environmentally hazardous; no special provisions.
Section 8 – Individual protection measures
According to the safety data information for the MSR Deck Caulk range, this mixture is classified as not hazardous under Regulation (EC) 1272/2008 [CLP], but it contains Trimethoxyvinylsilane, which may cause an allergic reaction and small amounts of methanol may be released during curing. Appropriate individual protection measures during professional use include:
Exposure controls
- Engineering controls: Ensure adequate ventilation, especially in confined areas.
Eye and face protection
- Wear safety glasses with side shields or goggles conforming to EN 166.
Hand protection
- Wear suitable chemical-resistant gloves, such as:
- Neoprene
- Nitrile rubber
- Butyl rubber
- Recommended glove thickness: > 0.7 mm.
- Typical breakthrough time: generally > 480 minutes (check with glove supplier and do not exceed specified breakthrough time).
- Gloves should comply with EN 374.
Skin and body protection
- Normally no special protective clothing is required under standard use conditions.
Respiratory protection
- If ventilation is insufficient, wear respiratory protection conforming to EN 140 with a Type A/P2 filter or better.
- Recommended filter type: organic gases and vapours filter conforming to EN 14387.
Hygiene measures
- Do not eat, drink or smoke while using the product.
- Wash hands before breaks and after finishing work.
*Contenido generado por IA
