Akzonobel - Formerly Mapaero THINNER 713 (1-LTR-CAN)

TOPCOAT XS420

Overview

TOPCOAT XS420 is a three-component, high-solids polyurethane aircraft topcoat designed for structural and external aerospace applications. It provides excellent chemical resistance, durability, and long-term surface protection. XS420 is recommended for use with SP350 chromate-free corrosion-resistant primer on metallic aircraft structures.

Key Technical Specs

• Product Type: Three-component polyurethane aircraft topcoat
• Application: Aircraft structural and exterior protection coatings
• Components: Base XS420 / Hardener XS420 / Thinners 713 or 713-2
• Theoretical Coverage: 13 m²/L or 529 ft²/gal at 40 µm (1.6 mils) dry film thickness
• Dry Film Weight: 1.5
• VOC Content: 420 g/L or 3.5 lb/gal (ISO 11890-1 and ASTM D 3960)
• Recommended Dry Film Thickness: 20-60 µm (0.8-2.4 mils)
• Wet Film Thickness: 45-120 µm (1.8-4.7 mils)
• Gloss Level: >85 GU at 60° for Black, Red, and Yellow tints; >90 GU at 60° for White and Grey tints
• Pot Life: 3 hours with Thinner 713 / 1 hour with Thinner 713-2
• Induction Time: None

Approvals & Specifications

• Qualified to Messier-Bugatti-Dowty IFC30-125-06
• Qualified to Aircelle HMRC0150A
• Designed for use with SP350 chromate-free corrosion-resistant primer

Typical Applications

• Aircraft structural protection coatings
• Exterior aircraft metallic components
• Steel and aluminium alloy airframe structures
• Commercial and aerospace OEM finishing systems
• Maintenance, repair, and overhaul (MRO) repainting

Surface Preparation & Compatibility

• Suitable for metallic substrates including steel and aluminium alloys
• Substrates should have surface treatment such as anodisation or conversion coating
• Apply over suitable epoxy primers such as SP350
• Primer application should follow the SP350 Technical Data Sheet requirements
• Ensure surfaces are clean, dry, and properly prepared before coating

Mixing & Application

• Spray Mixing Ratio by Weight: Base 100 / Hardener 26 / Thinner 20
• Spray Mixing Ratio by Volume: Base 3 V / Hardener 1 V / Thinner 1 V
• Store unmixed components between 18°C and 25°C for 24 hours before use
• Mix XS420 base for 5 minutes using pneumatic or oscillating mixer
• Mix base, hardener, and thinner until fully homogeneous
• Application Temperature: 15°C to 35°C

Spray Application Parameters

• Spraying Viscosity at 20°C:
• CA 4 Cup: 23 ± 5 seconds at 18°C-30°C
• ISO 4 Cup: 38 ± 5 seconds at 18°C-30°C
• CA 4 Cup: 21 ± 5 seconds at 30°C-35°C
• ISO 4 Cup: 35 ± 5 seconds at 30°C-35°C
• Gravity compressed air gun nozzle size: 1.3 mm to 1.8 mm
• Relative Humidity: 30 % to 85 %

Brush Application

• Mixing Ratio by Weight: Base 100 / Hardener 26
• Mixing Ratio by Volume: Base 3 V / Hardener 1 V
• Remove safety ring and activate hardener before use
• Shake container approximately 1 minute
• If material is not homogeneous, mix further using a clean stick
• Do not hermetically close touch-up kits after mixing base and hardener
• Pot Life: 3 hours

Coating Application

• Number of coats depends on component size and geometry
• For 20-40 µm dry film thickness:
• Apply two coats to achieve required thickness
• Allow 1 hour flash-off at 23°C ± 5°C before drying
• For 40-60 µm dry film thickness:
• Apply multiple coats to achieve required thickness
• Allow 1.5 hours flash-off at 23°C ± 5°C before drying

Equipment Cleaning

• Clean equipment using suitable cleaning thinner such as D713
• Use dry, oil-free compressed air during application

Drying & Curing

• Dry to Touch (Thinner 713): 8 hours at 23°C
• Dry to Handle (Thinner 713): 10-12 hours at 23°C
• Dry to Tape (Thinner 713): 16 hours at 23°C
• Fully Cured (Thinner 713): 7 days at 23°C
• Dry to Touch (Thinner 713-2): 4 hours at 23°C
• Dry to Handle (Thinner 713-2): 4.5-5.5 hours at 23°C
• Dry to Tape (Thinner 713-2): 6.5-7.5 hours at 23°C
• Fully Cured (Thinner 713-2): 3 days at 23°C
• Drying times are based on 40 µm dry film thickness
• Desolvation Time: 1 hour to 1.5 hours

Accelerated Drying Times

• Thinner 713:
• 40°C: Fully cured in 72 hours
• 60°C: Fully cured in 12 hours
• 80°C: Fully cured in 6 hours
• 100°C: Fully cured in 4 hours
• Thinner 713-2:
• 40°C: Fully cured in 24 hours
• 60°C: Fully cured in 7 hours
• 80°C: Fully cured in 3 hours

Packaging & Storage

• XS420 Base: 3 L
• XS420 Hardener: 1 L and 5 L
• Thinner D713: 1 L and 5 L
• Thinner D713-2: 1 L and 5 L
• Touch-Up Kits Available: 40 mL (30 mL Base + 10 mL Hardener)
• Shelf Life Base and Hardener: 18 months
• Shelf Life Thinner: 48 months
• Storage Temperature: 5°C to 35°C in sealed original packaging

Why This Product is Chosen for AOG / MRO

• High-solids polyurethane formulation reduces VOC while maintaining performance
• Provides excellent chemical and environmental resistance
• Produces durable aircraft structural finishes
• Compatible with approved chromate-free primer systems
• Suitable for both production and repair environments
• Flexible curing schedules support MRO operations

Practical Suggestions for Your Team (AOG Mindset)

• Condition components between 18°C and 25°C before mixing
• Mix XS420 base thoroughly before adding hardener and thinner
• Select thinner according to required working time and temperature conditions
• Monitor pot life carefully after mixing
• Maintain correct flash-off periods between coats
• Apply within recommended humidity and temperature limits
• Use clean, dry, oil-free spray air to avoid coating defects
• Clean equipment immediately after use with D713 thinner

Manufacturer / Aviation Spec Codes

• Product Name: TOPCOAT XS420
• Product Type: Three-component high-solids polyurethane aircraft topcoat
• Compatible Primer: SP350 Chromate-Free Corrosion Resistant Primer
• Specifications: Messier-Bugatti-Dowty IFC30-125-06, Aircelle HMRC0150A
• Application: Aircraft structural and exterior protective coating system