What is ALEXSEAL FLAT FINISH 555 and why choose it?
ALEXSEAL Flat Finish 555 is a two-component, polyurethane-based flat topcoat developed for professional use. It is designed to be easy to spray into an even, uniform layer, providing a durable weather-resistant matte finish. Typical applications include ceiling and other panels in exterior areas on a wide variety of substrates. The coating offers good adhesion, high resistance values and has been approved under IMO Resolution MSC.307 (88) (FTP-Code 2010) as a marine paint with low flame-spread characteristics.
Main features
- Two-component polyurethane system: Base material plus converter for a robust, durable coating.
- Flat (matte) finish: Produces a uniform, low-gloss surface on panels and similar components.
- Easy application: Formulated for straightforward spray application with conventional, HVLP and airless equipment.
- Weather resistant: Suitable for exterior areas where long-term resistance to weathering is required.
- Good adhesion on multiple substrates: Can be applied over appropriately prepared surfaces, including ALEXSEAL 442 primer.
- High resistance values: Designed for demanding environments with robust mechanical and chemical performance.
- Low flame-spread approval: Approved as a marine paint with low flame-spread characteristics according to IMO Resolution MSC.307 (88) (FTP-Code 2010).
- Wide white, gray and black range: Several base colors close to common RAL references, plus matching popular marine white and gray shades.
Technical characteristics and specifications
Colors
Base material shades (flat finish):
- F9003 Signal White (near RAL 9003) – also corresponds to Cloud White, Snow White, Matterhorn White, Carina White.
- F9010 Pure White (near RAL 9010) – also corresponds to Stark White, Oyster White, Off White, Fleet White.
- F9016 Traffic White (near RAL 9016) – no equivalent to other white colors.
- F7035 Light Gray (near RAL 7035) – also corresponds to Whisper Gray, Pearl Gray.
- F9005 Jet Black (near RAL 9005) – also corresponds to Super Jet Black.
Note: Matte color shades may not appear significantly different from each other and may correspond to more than one high-gloss color.
Converter: Clear.
Chemical and physical data
- Chemistry: Two-component polyurethane-based flat topcoat.
- Physical state: Liquid at 20–25 °C.
- Color: According to selected base color.
- Odor: Characteristic.
- Boiling range: Approximately 120 °C.
- Flash point: 35 °C (ISO 13736).
- Auto-ignition temperature: > 400 °C.
- pH (10 % dispersion, 20 °C): 6–8.
- Density (20 °C): Approximately 1.5 g/cm³.
- Water solubility: Insoluble; immiscible with water.
- VOC content (mixture as supplied): 22.73 % (approximately 340 g/L) according to Directive 2010/75/EU.
Coverage and film thickness
- Volume solids (catalyzed, without reduction): 62 %.
| Application method |
Coverage m²/L |
Coverage m²/gal |
Coverage sq. ft./gal |
Recommended DFT |
| Theoretical |
9 |
34.1 |
326 |
60–100 µm (2–4 mils) |
| Conventional air spray |
6 |
22.7 |
244 |
60–100 µm (2–4 mils) |
| HVLP air spray |
7 |
26.5 |
285 |
60–100 µm (2–4 mils) |
| Airless spray equipment |
9 |
34.1 |
367 |
60–100 µm (2–4 mils) |
Substrate preparation
- Substrate must be clean, dry and free from dust, grease, oil and other contamination.
- ALEXSEAL Flat Finish 555 can be applied directly to existing paint surfaces of ALEXSEAL 442 Primer.
- A light sanding with P240–320 abrasive is recommended before application.
Trade names and packaging
- Base: F…. ALEXSEAL Flat Finish 555 – 1 gallon can (filled to 0.823 US gal).
- Converter: C5556 ALEXSEAL Flat Finish 555 Converter – 1 pint.
- Reducer: R5557 ALEXSEAL Flat Finish 555 Reducer – 1 gallon.
Mixing ratio and thinning
- Mixing ratio (by volume):
- 7 parts ALEXSEAL Flat Finish 555 (Base F….).
- 1 part ALEXSEAL Flat Finish 555 Converter (C5556).
- Reducer: 15–20 % by volume ALEXSEAL Flat Finish 555 Reducer (R5557).
- The amount of reducer required may vary depending on application conditions.
- Mixed material must be thoroughly filtered before application.
Application parameters
- Viscosity (after mixing and reduction):
- Zahn #2 cup: ≈ 24–33 seconds.
- DIN 4 cup (4 mm): ≈ 20–30 seconds.
- Gravity-feed spray gun nozzle size: 1.6–2.0 mm (0.060–0.080 in), conventional and HVLP.
- Pressure pot fluid nozzle size: 1.2–1.5 mm (0.050–0.060 in), conventional and HVLP.
- Atomizing pressure: 2.0–4.0 bar (30–60 PSI), conventional and HVLP.
- Pot pressure: 1.0–2.0 bar (15–30 PSI), conventional and HVLP.
Recommended spray application
- Spray one cross-coat to a wet film thickness (WFT) of 125–150 µm (5–6 mils).
- This will achieve a dry film thickness (DFT) of approximately 60–100 µm (2–4 mils).
- If required, the application can be repeated after 1 hour at room temperature.
- Note: The final gloss of the paint film may vary when painting under different conditions such as airflow, temperature and humidity. Paint parts under equal conditions to ensure a uniform flat finish.
Pot life and drying times
Optimal application environment: minimum 15 °C (60 °F) / 40 % RH, up to maximum 30 °C (85 °F) / 80 % RH. Minimum application conditions should be 3 °C (5.4 °F) above the dew point.
| Temperature |
15 °C (60 °F) |
20 °C (68 °F) |
25 °C (77 °F) |
30 °C (85 °F) |
Maximum time |
| Pot life (approx.) |
90 min |
75 min |
60 min |
45 min |
Not applicable |
| Tape dry |
4.5 h |
3.5 h |
3 h |
2 h |
Not applicable |
| Fully cured |
7 days |
5 days |
3 days |
2 days |
N/A |
| Recoat after tack-up with ALEXSEAL Flat Finish (spray) |
90 min |
75 min |
60 min |
45 min |
2 h |
The table reflects approximate minimum and maximum times. Surface temperature, airflow, direct or indirect sunlight, quantity and/or type of reducer, and film thickness will affect actual tack-up, recoat and drying times. During drying, the minimum temperature is 15 °C (60 °F); ideal temperature is 25 °C (77 °F).
Applications and typical use cases
- Marine and yacht interiors/exteriors: Flat finishing of ceiling and wall panels in exterior areas where a uniform, non-gloss look is desired.
- Panel systems of various materials: Suitable for finishing panels made from different substrates, when properly prepared.
- Weather-exposed components: Areas that require good weather resistance and a robust, two-component polyurethane system.
- Low flame-spread marine areas: Applications where compliance with IMO MSC.307 (88) (FTP-Code 2010) low flame-spread characteristics is required.
FAQ – ALEXSEAL FLAT FINISH 555
1. What type of coating is ALEXSEAL Flat Finish 555?
It is a two-component, polyurethane-based flat topcoat designed for professional spray application.
2. On which substrates can I use Flat Finish 555?
It is used to finish panels made from a variety of materials. Surfaces must be clean, dry and free from contamination. It can be applied directly over ALEXSEAL 442 Primer after light sanding with P240–320.
3. Which mixing ratio should I use?
Mix 7 parts Flat Finish 555 base with 1 part Converter C5556 by volume, then reduce with 15–20 % R5557 Reducer, depending on application conditions.
4. What film thickness is recommended?
Spray one cross-coat to a wet film thickness of 125–150 µm (5–6 mils), resulting in a dry film thickness of 60–100 µm (2–4 mils).
5. How long is the pot life?
Depending on temperature, approximate pot life ranges from 90 minutes at 15 °C (60 °F) to 45 minutes at 30 °C (85 °F).
6. When can I recoat with Flat Finish 555?
Recoat by spray after tack-up, typically from 90 minutes at 15 °C (60 °F) down to 45 minutes at 30 °C (85 °F), with a maximum of 2 hours.
7. Is Flat Finish 555 suitable for exterior use?
Yes, it is weather resistant and specifically mentioned for exterior areas such as ceiling panels.
8. Does this product have low flame-spread properties?
Yes, it is approved by IMO Resolution MSC.307 (88) (FTP-Code 2010) as a marine paint with low flame-spread characteristics.
9. What spray equipment settings are recommended?
Use a 1.6–2.0 mm gravity gun nozzle or 1.2–1.5 mm pressure pot nozzle, with atomizing pressure of 2.0–4.0 bar (30–60 PSI) and pot pressure of 1.0–2.0 bar (15–30 PSI).
10. What is the appearance of the final surface?
The product provides a uniform flat (matte) finish. Final gloss may vary under different airflow, temperature and humidity conditions, so components should be painted under similar conditions to achieve a consistent appearance.
Section 14 – Transport information
- UN number / ID number: UN 1263.
- UN proper shipping name: PAINT.
- Transport hazard class: Class 3 (flammable liquids) for ADR, IMDG and IATA.
- Packing group: III.
- ADR:
- Classification code: F1.
- Hazard identification number: 30.
- Labels: 3.
- Tunnel restriction code: (D/E).
- Environmentally hazardous: no.
- Note: Receptacles with less than 450 L capacity are not subject to ADR 4.1, 5.2 and 6.1 requirements in accordance with ADR 2.2.3.1.5.
- IMDG:
- Labels: 3.
- EmS code: F-E, S-E.
- Marine pollutant: no.
- Note: Receptacles with less than 450 L capacity are not subject to IMDG chapters 4.1, 5.2 and 6.1 (IMDG 2.3.2.5).
- IATA (cargo aircraft):
- Packing instruction: 366.
- Labels: Flammable Liquids.
- Packing group: III.
- IATA (passenger aircraft):
- Packing instruction: 355.
- Limited quantity packing instruction (LQ): Y344.
- Labels: Flammable Liquids.
- Packing group: III.
- Special precautions for user: Within the user’s premises, transport only in closed, upright and secure containers. Personnel handling the product should be informed of procedures in case of incident or spillage.
- Maritime bulk transport: Not applicable for the product as supplied.
- The transport classifications above refer to the unpackaged material as described in the Safety Data Sheet. Actual classifications may vary with packaging, mode of transport and regional regulations.
Section 8 – Personal protective measures
The following personal protective equipment and safety measures are indicated for handling and applying ALEXSEAL Flat Finish 555:
Engineering controls
- Provide adequate ventilation. Preferably use local exhaust ventilation and good general extraction.
- If ventilation does not keep aerosol and solvent vapor concentrations below occupational exposure limits, suitable respiratory protection must be worn.
Eye and face protection
- Wear safety goggles to protect against solvent splashes.
Hand protection
- Use chemical-resistant protective gloves tested according to EN 374.
- Recommended glove materials for short-term contact (splash protection):
- Nitrile rubber.
- Neoprene.
- Recommended characteristics:
- Material thickness: > 0.4 mm.
- Breakthrough time: > 480 minutes.
- Before use, test gloves for suitability at the specific workplace (mechanical resistance, product compatibility, antistatic properties).
- Follow glove manufacturer instructions for use, storage, care and replacement. Replace gloves immediately if damaged or worn.
- Preventive skin protection cream is recommended, and contaminated skin should be washed immediately.
Skin and body protection
- Wear protective clothing adapted to the potential presence of dangerously explosive atmospheres.
Respiratory protection
- If solvent vapor concentration exceeds air limit values, wear an approved breathing apparatus.
- Use a half-mask model with appropriate cartridge or an air-fed system.
- Dry grinding, torch cutting and welding can produce hazardous dust and/or vapor; where possible, use wet methods and install exhaust hoods to capture vapors and fumes.
- If operators must work inside a spray booth during application, they should wear a compressed air-fed respirator until particulate and solvent concentrations fall below exposure limits.
General protective measures and hygiene
- Do not eat, drink or smoke while using the product.
- Avoid contact with skin, eyes and clothing.
- Avoid inhalation of dust from sanding, particulates and spray mist.
*Contenido generado por IA
