What is TOPCOAT 501 CONVERTER SPRAY and why choose it?
TOPCOAT 501 CONVERTER SPRAY (ALEXSEAL C5051) is a professional two-component hardener based on polyisocyanates, specifically formulated to convert ALEXSEAL Premium Topcoat 501 base color for spray application. When mixed with the 501 base and the appropriate reducer, it delivers an extreme high-gloss, wet-look polyurethane finish designed for the yacht industry and other demanding marine environments.
Combined with Premium Topcoat 501, this converter provides excellent gloss and color stability, high resistance to UV, salt water, abrasion and fuel, and is intended for high-end exterior and interior spray applications where a durable and visually distinctive finish is required.
Main features
- Polyisocyanate-based hardener specifically engineered for ALEXSEAL Premium Topcoat 501 in spray application.
- Professional two-component system that, when mixed with 501 base and reducer, forms a high-gloss, wet-look polyurethane coating.
- Developed for the yacht industry, suitable for exterior and interior areas not subject to permanent water immersion.
- High durability of the resulting topcoat system: excellent gloss and color stability, even under extreme climatic conditions.
- Resistance of the finished system against UV rays, salt water, abrasion and fuel (properties of Premium Topcoat 501 system).
- Optimized for spray processing with defined viscosity range and spray equipment parameters.
- Professional use only with mandatory adequate training for industrial or professional users from 24 August 2023.
Technical specifications
Chemical and physical data (converter)
- Chemical nature: Hardener based on polyisocyanates (hexamethylene diisocyanate oligomers).
- Physical state: Liquid (20 – 25 °C, 1,013 hPa).
- Colour: According to product designation.
- Odour: Characteristic.
- Boiling point: approx. 120 °C.
- Flash point: 8 °C (ISO 13736).
- Auto-ignition temperature: > 400 °C.
- Explosion limits: 1.0 – 10.0 % (V).
- Water solubility: Insoluble; immiscible with water.
- Vapour pressure: approx. 100 hPa (50 °C).
- Density: 1.01 g/cm³.
- Viscosity (kinematic): > 6 mm²/s.
- Solvent separation: < 3 % (V).
- VOC content (converter): 58.75 %, 593 g/l.
Relevant composition (converter)
- Hexamethylene diisocyanate oligomers: approx. 40 – 100 %.
- 2-methoxy-1-methylethyl acetate: approx. 25 – < 40 %.
- n-butyl acetate: approx. 12.5 – < 20 %.
- Ethyl acetate: approx. 10 – < 12.5 %.
System information with ALEXSEAL Premium Topcoat 501
- Coating type: Two-component polyurethane topcoat system (Premium Topcoat 501 base + C5051 converter + reducer).
- Application areas: Exterior and interior surfaces not subject to permanent water immersion.
- Volume solids (topcoat system, catalyzed without reduction): whites approx. 42 %, colors approx. 38 %.
- Theoretical coverage at 75 μm (3 mils) DFT (topcoat system):
- Brushing and rolling (theoretical): 6 m²/l (22.7 m²/gal; 244 ft²/gal).
- Conventional air spray: 3.6 m²/l (13.6 m²/gal; 146 ft²/gal).
- HVLP air spray: 4.5 m²/l (17 m²/gal; 183 ft²/gal).
Mix ratios (with Premium Topcoat 501)
- Spray application:
- 1 part by volume Premium Topcoat 501 base color (T…)
- 1 part by volume C5051 Topcoat Converter Spray
- 30 – 37.5 % by volume ALEXSEAL Topcoat Reducer (R5070 / R5050 / R5030, as specified).
- Example: 1 : 1 : 0.75 = 37.5 % reduction.
- Brush/Roll (using C5012, not this converter): 2 : 1 with R5015 brush reducer at 16 – 33 % reduction.
Application parameters (topcoat system)
- Recommended viscosity: Zahn #2 ≈ 15 – 18 s; DIN 4 mm ≈ 12 – 16 s; ISO 3 mm ≈ 45 – 55 s.
- Nozzle sizes:
- Gravity gun: 1.0 – 1.4 mm (conventional & HVLP).
- Siphon cup: 1.6 mm (conventional & HVLP).
- Pressure pot: 1.0 – 1.3 mm (conventional & HVLP).
- Airmix equipment: 0.18 – 0.28 mm; inlet pressure 3.0 – 5.0 bar (42 – 70 PSI).
- Atomizing pressure: 3.0 – 5.0 bar (42 – 70 PSI).
- Pot pressure (pressure pot): 0.7 – 1.5 bar (10 – 20 PSI).
Recommended film thickness and drying (topcoat system)
- Spray application:
- 2–3 coats at 50 – 75 μm (2 – 3 mils) WFT per coat.
- Flash/tack time between coats: approx. 20 – 60 minutes.
- Resulting DFT: approx. 30 – 50 μm (1.5 – 2 mils) in 2 coats; 50 – 70 μm (2 – 3 mils) in 3 coats.
- Max. recommended total during spray: 3 coats, 225 μm (9 mils) WFT, 75 μm (3 mils) DFT.
- Brush/Roll application:
- 2–3 coats at 50 – 75 μm (2 – 3 mils) WFT per coat.
- Each coat to reach “tape dry” in approx. 12 – 24 h before sanding (320–400 grit) and recoating.
- Resulting DFT comparable to spray application.
- Pot life and drying range (standard, without accelerator):
- Optimal environment: 15 – 30 °C, 40 – 80 % RH.
- Approximate pot life: 6 h at 15–20 °C; 4 h at 25–30 °C.
- Dust free: approx. 90 min (15 °C) to 30 min (30 °C).
- Tape dry: approx. 36 h (15 °C) to 18 h (30 °C).
- Full cure (without accelerator): approx. 21 days (15 °C) to 10 days (30 °C).
- With A5035 Topcoat 501 Accelerator:
- Max. 10 ml (1/3 oz) per mixed 2 quarts (2 liters).
- Reduces pot life to approx. 3 h (15–20 °C) or 2 h (25–30 °C).
- Reduces tape dry and total dry times accordingly.
Applications and use cases
- Yacht exteriors: Spray-applied, high-gloss topcoat system for hulls, superstructures and topsides where premium aesthetics and long-term durability are required.
- Yacht interiors: High-quality decorative topcoat on prepared interior surfaces not continuously immersed in water.
- Marine refit and repair: Recoating of existing ALEXSEAL Premium Topcoat 501 surfaces within the recommended recoat windows.
- Industrial serial painting: Professional finishing lines using ALEXSEAL Premium Topcoat 501 in combination with C5051 for consistent, repeatable spray results.
Only trained professional applicators should use this converter and the associated topcoat system.
FAQ – TOPCOAT 501 CONVERTER SPRAY
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Is TOPCOAT 501 CONVERTER SPRAY a paint or a hardener?
It is a converter (hardener) based on polyisocyanates. It must be mixed with ALEXSEAL Premium Topcoat 501 base color and an appropriate reducer to form a sprayable two-component polyurethane coating.
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What is the correct mixing ratio for spray application?
The recommended mix is 1 part 501 base color, 1 part C5051 converter, plus 30 – 37.5 % ALEXSEAL Topcoat Reducer by volume.
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Can this converter be used for brush or roll application?
No. For brush and roll application, ALEXSEAL C5012 Topcoat Converter Brush should be used together with R5015 Topcoat Reducer Brush.
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What pot life can I expect after mixing?
Under optimal conditions (15 – 25 °C) pot life is typically about 4–6 hours without accelerator, and 2–3 hours with A5035 Topcoat 501 Accelerator.
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What finish does the complete system provide?
When correctly applied, the Premium Topcoat 501 system delivers an extreme high-gloss, wet-look finish with excellent distinction of image, specifically developed for the yacht sector.
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Is the cured system resistant to marine conditions?
Yes. Once cured, ALEXSEAL Premium Topcoat 501 offers excellent gloss and color stability and is highly resistant to UV rays, salt water, abrasion and fuel.
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Can I recoat with another product over the cured topcoat?
Yes, but surface preparation including sanding is required, and overcoating must respect the maximum times indicated in the technical data sheet.
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Is this product suitable for DIY users?
No. The converter and the complete topcoat system are intended for professional use only, with mandatory adequate training for industrial or professional users.
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What should I do if mixed material becomes too thick during application?
Within the recommended limits, additional reducer may be added to the mixed paint pot to improve flow-out consistency and finish quality.
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Where can I find more detailed technical limits not listed here?
Consultar ficha técnica del fabricante.
Section 14 – Transport information
The following data refer to the transport classification of ALEXSEAL C5051-Topcoat Converter Spray:
- UN number / ID number: UN 1263.
- UN proper shipping name (ADR / IMDG / IATA): PAINT RELATED MATERIAL.
- Transport hazard class: Class 3 (flammable liquids).
- Packing group: II.
- ADR classification code: F1.
- ADR hazard identification number: 33.
- ADR tunnel restriction code: (D/E).
- IMDG EmS code: F-E, S-E.
- IATA packing instructions: 364 (cargo aircraft); 353 (passenger aircraft); LQ Y341.
- Environmentally hazardous (ADR): No.
- Marine pollutant (IMDG): No.
If transported within the user’s premises, containers should always be closed, upright and secure, and personnel must know how to respond in case of incident or spillage.
Section 8 – Individual protection measures
The following personal protective measures apply during handling, mixing and application of ALEXSEAL C5051-Topcoat Converter Spray and the resulting spray system:
Engineering controls
- Ensure good ventilation through local exhaust and general extraction.
- If ventilation is insufficient to keep vapour and particulate levels below occupational exposure limits, appropriate respiratory protection must be used.
Eye and face protection
- Wear suitable safety goggles designed to protect against solvent splashes.
Hand protection
- Use chemical-resistant protective gloves tested to EN 374.
- Recommended materials for short-term contact (splash protection): nitrile rubber or neoprene.
- Minimum material thickness: > 0.4 mm.
- Breakthrough time: > 480 minutes.
- Check glove suitability for the specific workplace (mechanical resistance, product compatibility, antistatic properties).
- Replace gloves immediately if damaged or showing signs of wear.
- Use preventive skin protection (protective skin cream) and wash contaminated skin immediately.
Skin and body protection
- Wear antistatic protective clothing suitable for potentially explosive atmospheres, using natural fibres (e.g. cotton) or heat-resistant synthetic fibres as specified.
Respiratory protection
- During spraying: use an air-fed respirator.
- For other operations in well-ventilated areas: combination of charcoal/gas filter and particulate filter mask (e.g. half-mask model with cartridge or air-fed equipment).
General protective measures
- Persons with a history of asthma, allergies, or chronic/recurrent respiratory disease should not work with this preparation.
- Do not eat, drink or smoke during work.
- Avoid contact with skin, eyes and clothing.
- Avoid inhalation of vapours, spray mist, particulates and sanding dust from the coating.
*Contenido generado por IA
