What is Clear Wood Sealer Part B and why choose it?
Clear Wood Sealer Part B from International Náutica is the hardener/curing component of the Clear Wood Sealer Fast Dry two-pack polyurethane primer system. When mixed 1:1 by volume with Part A, it creates a premium, fast-drying clear primer designed for interior and exterior wood above the waterline. The system offers exceptional impact, scratch and wear resistance and allows up to four coats to be applied in a single day at 25°C (unthinned), saving time in demanding refit or new-build projects.
This component is formulated for professional and industrial use in a controlled environment, where high build, clarity and durability are required on marine plywood and tropical hardwood substrates.
Main features
- Two-pack polyurethane system: Part B is the converter for Clear Wood Sealer Fast Dry, forming a tough, chemically cured film when mixed 1:1 with Part A.
- Fast drying: Touch dry in as little as 10–30 minutes depending on temperature, with short overcoating times that enable multiple coats per day.
- High-build clear primer: Provides a clear, high gloss primed surface ready for overcoating with a wide range of compatible varnishes and finishes.
- Excellent mechanical resistance: Designed to give an impact, scratch and wear-resistant base coat on wood above the waterline.
- Versatile overcoating: Can be overcoated (within stated times) with Clear Wood Sealer Fast Dry, Compass, Goldspar Satin, Perfection, Perfection Plus Varnish/Glazecoat (Professional), Perfection Pro Varnish, Schooner Gold and Toplac.
- Engineered for marine wood: Suitable for marine plywood and tropical hardwood that has been properly sanded, cleaned and degreased.
- Controlled application: Can be applied by brush, roller or conventional spray (spray for professional applicators only).
- Consistent mix ratio: 1:1 mixing ratio by volume and by weight with Part A simplifies accurate proportioning.
Technical specifications
System and mixing
- Product type: Clear, two-pack polyurethane primer system (Part B is the curing agent).
- Mix ratio: 1:1 by volume with Clear Wood Sealer Fast Dry Part A (YVA327). Mix ratio by weight: 1:1.
- Converter/curing agent code: YVA328.
- Typical shelf life: 2 years.
Appearance and physical data (Part B)
- Colour: Colourless liquid.
- Finish (system): High gloss.
- Density (Part B): 1.025 g/cm³ (DIN EN ISO 2811-1).
- Boiling point (mixture data): Approx. 126°C.
- Flash point: 32°C (closed cup, Pensky-Martens).
- Viscosity (Part B): Kinematic approx. 98 mm²/s at room temperature; 100 mm²/s at 40°C (DIN EN ISO 3219).
- Solubility in water: Not soluble in cold water.
System performance data (mixed product)
- Specific gravity (system): Approx. 1.03.
- Volume solids: 38%.
- VOC (as supplied): 582 g/L.
- VOC (EU Solvent Emissions Directive): 565.05 g/kg.
- Recommended number of coats: Minimum 4 coats, including the first thinned coat; more may be required for very porous woods.
- Recommended DFT per coat (brush): 35 microns dry.
- Recommended WFT per coat (brush): 91 microns wet.
- Theoretical coverage: Approx. 11 m²/L per coat.
- Practical coverage (brush/roller): Approx. 10 m²/L per coat.
Drying and overcoating times (mixed product)
Touch dry (approximate):
- 5°C: 30 minutes
- 15°C: 15 minutes
- 25°C: 15 minutes
- 35°C: 10 minutes
Pot life (after mixing Part A + Part B):
- 5°C: 3 hours
- 15°C: 3 hours
- 25°C: 3 hours
- 35°C: 2 hours
Typical minimum overcoating intervals (with compatible products):
- 5°C: 24 hours (min)
- 15°C: 6 hours (min)
- 25°C: 3 hours (min)
- 35°C: 2 hours (min)
Maximum overcoating time is described as “ext” (no defined maximum) within the system documentation.
Substrate and application conditions
- Suitable substrates: Marine plywood and tropical hardwood, well sanded, cleaned and appropriately degreased.
- Substrate temperature: Minimum 5°C / 41°F, maximum 35°C / 95°F.
- Ambient temperature: Minimum 5°C / 41°F, maximum 35°C / 95°F.
- Dew point margin: Substrate should be at least 3°C / 5°F above dew point to prevent condensation.
- Relative humidity: Greater than 30% and not exceeding 80%.
Thinners, cleaning and application parameters
- Brush/roller thinner: YTA006 Thinner No. 9.
- Spray thinner: YTA910 Fast Spray Solvent or YTA064 Thinner No. 10 (AP) / Thinner No. 10.
- Brushing: Thin first coat by 25% with Thinner No. 9.
- Roller application: Thin each coat approx. 10% with Thinner No. 9.
- Conventional spray: Thin 10–15% by volume with YTA910, YTA064 (AP) or Thinner No. 10. Pressure 3.5–4.0 bar (50–60 psi), tip size 1.0–1.4 mm. Spray application for professional applicators only.
- Cleaning of tools: YTA910/YTA006, YTA064 Thinner No. 10 or Thinner No. 9.
Applications and use cases
Typical uses
- Marine wood primer above the waterline: Ideal as a clear sealer/primer for wooden surfaces on yachts and boats that remain above the waterline.
- Interior and exterior brightwork: Provides a tough, clear base for high quality varnish systems on handrails, trim, masts, spars and decorative wood details.
- Professional refit and new-build projects: Fast drying and multi-coat capability make it suitable for time-sensitive professional applications in yards and workshops.
Surface preparation examples
- Previously varnished wood in good condition (two-pack only): Clean with thinners, sand smooth with 280–320 grit paper and remove sanding dust with thinners.
- Previously varnished wood in poor condition or one-pack coatings: Remove all previous coatings before priming.
- Bare wood: Sand with 180 grit, then lightly with 240 grit. Remove all sanding debris; allow any solvent wiping to dry completely.
- Priming bare wood: Thin the first coat by 25% with Thinner No. 9 to aid penetration (this will increase drying time of the first coat).
- Oily woods (e.g. teak): Thoroughly degrease with Thinners No. 4, 9 or 10 and allow to dry completely. Sand loose or flaking areas with 320 grit paper before coating.
Application guidance
- Apply a minimum of four coats, including the first thinned coat; more coats may be required to fully fill open grain.
- Sanding between coats is not mandatory, but light sanding with 320-grit paper will improve cosmetic finish.
- Avoid painting in direct sunlight or on hot surfaces.
- Clear Wood Sealer Fast Dry (Part A + Part B) should only be used as a primer/sealer and always followed by a suitable finishing system.
- The product may darken on exposure and is not recommended on very light-coloured woods such as ash or light-coloured oak.
- Do not apply over conventional paints or flexible constructions.
FAQ
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What is the mixing ratio for Clear Wood Sealer Part B?
Clear Wood Sealer Part B must be mixed 1:1 by volume (and 1:1 by weight) with Clear Wood Sealer Fast Dry Part A (YVA327) before use.
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How many coats are recommended?
A minimum of four coats is recommended, including the first thinned coat. Very porous woods may need additional coats to completely fill the grain.
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Do I need to sand between coats?
Sanding between coats is not required, but light sanding with 320-grit paper between coats will improve the final appearance.
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Where can I use this system on my boat?
Clear Wood Sealer Fast Dry (Part A + Part B) is suitable for interior and exterior wood surfaces above the waterline, on marine plywood and tropical hardwood that are properly prepared.
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Can I spray apply Part B and the mixed product?
Yes, conventional spray application is possible when the mixed product is thinned 10–15% with the recommended thinner, using 3.5–4.0 bar (50–60 psi) and 1.0–1.4 mm tip size. Spray application is for professional applicators only and requires appropriate respiratory protection and ventilation.
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What are the ideal application conditions?
Ambient and substrate temperatures should be between 5°C and 35°C, with the substrate at least 3°C above the dew point and relative humidity between 30% and 80%. Avoid direct sunlight.
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Does the product affect the colour of light woods?
Yes. The product may darken on exposure and is not recommended on light-coloured woods such as ash or light-coloured oak.
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How should leftovers and empty containers be disposed of?
Do not pour product into watercourses or drains. Remainders cannot be disposed of via normal municipal waste and must be handled in consultation with the relevant authorities. Empty containers and liners may contain residues and should be disposed of safely via authorised waste contractors.
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Is Clear Wood Sealer Part B suitable for consumers?
The safety data sheet states “For professional use only.” It should be applied in a controlled environment by trained users following all safety guidance.
Section 14 – Transport information
- UN number: UN1263
- UN proper shipping name: PAINT
- Transport hazard class: Class 3 (flammable liquid)
- Packing group: III
- Environmental hazards: Not classified as environmentally hazardous for transport (ADR/RID/IMDG/IATA).
- ADR/RID tunnel code: D/E
- IMDG emergency schedules (EmS): F-E, S-E
- Special precautions for user: Transport only in closed, upright and secure containers. Ensure personnel know what to do in case of accident or spillage.
- Bulk transport according to IMO instruments: Not applicable.
Section 8 – Individual protection measures
The following personal protective equipment and controls are indicated in the safety data sheet for Clear Wood Sealer Part B. Selection must be based on a site-specific risk assessment.
Engineering controls
- Use only with adequate ventilation.
- Employ process enclosures, local exhaust ventilation or other engineering controls to keep airborne concentrations below occupational exposure limits and below the lower explosive limit.
- Use explosion-proof ventilation equipment.
General hygiene measures
- Wash hands, forearms and face thoroughly after handling and before eating, smoking, using the lavatory and at the end of the work period.
- Use appropriate techniques to remove contaminated clothing; wash before reuse and do not allow contaminated workwear out of the workplace.
- Ensure eyewash stations and safety showers are close to work areas.
Eye and face protection
- Wear chemical splash goggles or equivalent eye protection compliant with an approved standard when there is a risk of splashes, mists, gases or dusts.
Hand protection
- Wear chemical-resistant, impervious gloves meeting EN 374 or equivalent.
- For prolonged or frequently repeated contact, gloves with protection class 6 (breakthrough time > 480 minutes) are recommended; suggested materials: Viton or nitrile, thickness ≥ 0.38 mm.
- For brief contact, gloves with protection class 2 or higher (breakthrough time > 30 minutes) are recommended; suggested material: nitrile, thickness ≥ 0.12 mm.
- Replace gloves regularly and immediately if damaged. The final glove choice must consider all conditions of use as per the user’s risk assessment.
Skin and body protection
- Wear suitable protective clothing selected for the specific task and risks, approved by a specialist.
- Where there is a risk of ignition from static electricity, use anti-static protective clothing including overalls, boots and gloves (see EN 1149).
Respiratory protection
- Where exposure above occupational limits is possible, wear a respirator conforming to EN140 with type A/P2 filter or better, within a respiratory protection programme.
- Dry sanding, flame cutting or welding of the dry film can produce hazardous dust or fumes; wet sanding/flatting is preferred. If adequate local exhaust ventilation is not possible, use suitable respiratory protection.
Environmental exposure control
- Check emissions from ventilation and process equipment to ensure compliance with environmental regulations.
- Where necessary, fit fume scrubbers, filters or modify processes to reduce emissions.
*Contenido generado por IA
