What is Interior Finish 750 Part A and why choose it?
INTERIOR FINISH 750 PART A from International Náutica is the base component of a high quality, two-pack polyurethane interior coating system. Designed specifically for interior areas such as engine rooms, cabins, trims, bilges and lockers, it delivers a durable, chemical-resistant, high gloss finish in off-white and pastel shades. When used as part of an approved interior system over Interior Primer 860, the coating achieves a Surface Spread of Flame (SSoF) certification and has been tested to IMO Resolution A.653(16) / MSC 61(67) Annex 1 Part 5 for low flame spread on marine-grade steel bulkheads.
The product is suitable for professional, industrial and consumer use on properly prepared and primed substrates including steel, aluminium, stainless steel, laminate, gelcoat and powder-coated surfaces.
Main features
- Two-pack polyurethane system – Part A base used with YIC700 converter for a tough, long-lasting interior finish.
- High gloss appearance – bright, smooth finish; for satin finishes Interior Finish 770 is recommended.
- Broad colour offer – white and light grey shades including YIC750 RAL 9003 white, YIC755 RAL 9010 white, YIC752 RAL 7035 light grey, YIC753 RAL 7038 grey and YIC757 white binder base.
- Excellent wear and chemical resistance – formulated to resist wear and tear and maintain clean, easy-to-wash surfaces in demanding marine interiors.
- Flexible application – can be applied by brush, conventional spray or roller, allowing efficient coating of large areas and complex details.
- Low flame spread performance – in a representative system (Interior Primer 860 + Interior Finish 750 on 3 mm marine-grade steel) the coating achieved IMO low flame spread criteria and complies with SOLAS 1974 for surface flammability.
- Compliant VOC levels – VOC (as supplied) 440 g/L; EU Solvent Emissions Directive value 345 g/kg (1999/13/EC).
Technical specifications
- Product type: Two-component polyurethane interior finish (Part A base)
- Product use: Two component coating for interior use
- Brand: International Náutica (AkzoNobel)
- Finish: High gloss
- Specific gravity (density): 1.28 (product sheet) / 1.319 g/cm³ (SDS, DIN EN ISO 2811-1)
- Volume solids: 51 %
- Mix ratio: 6:1 by volume (Part A base : YIC700 converter)
- Converter / curing agent: YIC700
- Typical shelf life: Base 3 years; Converter 2 years
- VOC (as supplied): 440 g/L
- VOC (EU Solvent): 345 g/kg (EU Solvent Emissions Directive 1999/13/EC)
- Physical state: Liquid
- Colour: White and light grey shades (e.g. RAL 9003, RAL 9010, RAL 7035, RAL 7038)
- Flash point: 33 °C (closed cup, Pensky-Martens)
- Boiling point: 139 °C
- Explosion limits: approx. 1.4 – 7.6 vol % (based on n-butyl acetate component)
- Viscosity (kinematic): approx. 212 mm²/s at room temperature; 280 mm²/s at 40 °C (DIN EN ISO 3219)
- Solubility in water: Not soluble
- Recommended number of coats: 1–2
- Recommended DFT per coat: 25 µm by brush; 40 µm by spray
- Recommended WFT per coat: 49 µm by brush; 78 µm by spray
- Theoretical coverage per coat: 20.5 m²/L (835 ft²/gal) by brush; 12.8 m²/L (522 ft²/gal) by spray
- Practical coverage per coat: 18.5 m²/L (754 ft²/gal) by brush; 7.7 m²/L (314 ft²/gal) by spray
Drying and pot life (mixed product)
- 10 °C: Touch dry 8 h; Hard dry 24 h; Walk-on 48 h; Pot life 8 h
- 23 °C: Touch dry 4 h; Hard dry 8 h; Walk-on 24 h; Pot life 4 h
- 35 °C: Touch dry 2 h; Hard dry 4 h; Walk-on 16 h; Pot life 3 h
- Overcoating with Interior Finish 750: min 24 h at 10 °C / 8 h at 23 °C / 4 h at 35 °C (no maximum, provided surface remains clean and sound)
Pot life decreases as temperature and mix volume increase. Do not mix more than can be used within the working pot life.
Substrate compatibility and primers
- Compatible application methods: Brush, conventional spray, roller (airless spray not recommended)
- Recommended primers: Interior Primer 860 or Interior Primer 333WB (EU only)
- Suitable substrates (when correctly prepared and primed): steel, shop-primed steel, aluminium, stainless steel, laminate (no exposed fibres), gelcoat, powder-coated surfaces
- Not suitable for: Permanently immersed surfaces; application over conventional (one-pack) coatings
Applications and use cases
Typical areas on yachts and vessels
- Engine rooms and machinery spaces: resistant high gloss finish that withstands solvent and oil contamination when applied over the recommended primers.
- Cabins and accommodation areas: light, bright finish in off-white and pastel shades, contributing to a clean interior appearance.
- Trims, lockers and storage areas: hard-wearing coating for frequently used surfaces and confined spaces.
- Bilges and technical voids: smooth surface that facilitates inspection and cleaning (not for permanent immersion).
Application guidance (summary)
- Surface preparation: all substrates must be clean, dry, degreased and correctly profiled, then primed with Interior Primer 860 or Interior Primer 333WB (EU only).
- Mixing: stir or shake each component thoroughly. Add YIC700 converter to Part A in a 6:1 volume ratio and mix well.
- Thinning: YTA100, Thinner No. 16, Thinner 910 or Thinner 920, following the indications in the technical sheet (e.g. 20–30 % with YTA910 for conventional spray; 0–5 % with YTA100 for brush or roller).
- Application conditions: ambient, substrate and product temperature between 10–35 °C; substrate at least 3 °C / 5 °F above dew point; relative humidity maximum 80 %.
- Film thickness targets: by brush 25 µm DFT (49 µm WFT); by spray 40 µm DFT (78 µm WFT). Maximum DFT per coat: approx. 60 µm by any method (corresponding WFT values in the product sheet).
- Ventilation: continuous extraction required in confined spaces during application and drying to remove solvent vapours and support curing.
FAQ
1. What is INTERIOR FINISH 750 PART A used for?
It is the base component of a two-pack polyurethane coating designed for interior areas of boats and ships, such as engine rooms, cabins, trims, bilges and lockers, when mixed with YIC700 converter.
2. Can it be applied over existing coatings?
It should not be applied over conventional (one-pack) coatings. It is intended to be applied over compatible two-pack primers such as Interior Primer 860 or Interior Primer 333WB (EU only) on properly prepared substrates.
3. Which application methods are recommended?
The product can be applied by brush, conventional spray or roller. Airless spray is not recommended.
4. How long can I work with the mixed product?
Pot life is approximately 8 hours at 10 °C, 4 hours at 23 °C and 3 hours at 35 °C. Pot life decreases as temperature and mix volume increase.
5. Is the coating suitable for underwater or permanently immersed areas?
No. The product sheet specifies that it is not suitable for permanently immersed surfaces.
6. What finish does INTERIOR FINISH 750 provide?
It provides a high gloss finish. For satin finishes, Interior Finish 770 is recommended.
7. Does the system have fire performance certification?
When applied over Interior Primer 860 on 3 mm marine-grade steel, the coating system has been tested according to IMO Resolution A.653(16) / MSC 61(67) Annex 1 Part 5 and meets low flame spread criteria, supporting compliance with SOLAS 1974 for surface flammability.
8. What is the recommended storage temperature?
Containers should be stored tightly closed between 5 °C and 35 °C, away from direct sunlight and extremes of temperature.
9. Is the product classified as hazardous?
Yes. According to Regulation (EC) 1272/2008 it is classified as a flammable liquid (Category 3) and causes skin and eye irritation, may cause drowsiness or dizziness, may cause damage to organs through prolonged or repeated exposure and is harmful to aquatic life with long lasting effects.
10. Is INTERIOR FINISH 750 PART A for professional use only?
The safety data sheet notes professional and industrial use, and also lists consumer use. Local regulations and guidance should be followed.
Section 14 – Transport information
According to the transport information provided in the safety data sheet, the mixed product is classified for transport as follows:
- UN number: UN1263
- UN proper shipping name: PAINT
- Transport hazard class: Class 3 (flammable liquid)
- Packing group: III
- Environmental hazards: Not classified as hazardous to the environment for transport purposes.
- ADR/RID: Class 3, Packing group III; Tunnel code (D/E)
- IMDG: Class 3, Packing group III; Emergency schedules F-E, S-E
- IATA: Class 3, Packing group III
- Special precautions for user: Transport within user’s premises in closed, upright and secure containers. Persons transporting the product should know what to do in case of accident or spillage.
- Transport in bulk according to IMO instruments: Not applicable.
Section 8 – Individual protection measures
The product contains organic solvents and is classified as a flammable and irritating mixture. The following personal protection and exposure control measures are indicated in the safety data sheet:
Engineering controls and hygiene
- Use only with adequate ventilation. Employ process enclosures or local exhaust ventilation to keep vapour concentrations below occupational exposure limits and below lower explosive limits.
- Use explosion-proof ventilation and electrical equipment.
- Wash hands, forearms and face thoroughly after handling, before eating, drinking or smoking and at the end of work.
- Remove contaminated clothing and wash before reuse. Ensure eyewash stations and safety showers are available near the workplace.
Eye and face protection
- Wear chemical splash goggles or equivalent eye protection that complies with an approved standard whenever there is a risk of splashes, mists or vapours.
Hand protection
- Wear chemical-resistant, impervious gloves complying with an approved standard.
- For prolonged or frequently repeated contact, use gloves with protection class 6 (breakthrough time > 480 min, EN374). Recommended materials: Viton® or nitrile, thickness ≥ 0.38 mm.
- For brief contact, gloves of protection class ≥ 2 (breakthrough time > 30 min, EN374) are acceptable. Recommended material: nitrile, thickness ≥ 0.12 mm.
- Replace gloves regularly and immediately if damaged. The effective protection time depends on the specific glove manufacturer and conditions of use.
Skin and body protection
- Wear suitable protective clothing selected according to the task and risks, such as overalls.
- Where there is a risk of ignition due to static electricity, use anti-static protective clothing including overalls, boots and gloves (see EN 1149 for guidance).
- Use appropriate protective footwear and any additional skin protection as required by the risk assessment.
Respiratory protection
- When ventilation is insufficient, wear a respirator conforming to EN140 fitted with an A/P2 type filter or better, selected on the basis of a formal respiratory protection program.
- During dry sanding, flame cutting or welding of the dry paint film, hazardous dust and fumes may be generated; wet sanding/flatting is preferred. If exposure cannot be controlled by local exhaust ventilation, appropriate respiratory protection must be used.
Environmental exposure controls
- Emissions from ventilation and process equipment must comply with applicable environmental regulations; if necessary, use fume scrubbers, filters or engineering modifications to reduce emissions.
- Prevent releases to drains and watercourses; waste paint and contaminated materials must be disposed of via authorised routes under the relevant regulations.
*Contenido generado por IA
