PU 55
HB TOPCOAT
PU 55 HB Topcoat is a two-component, solvent-based, high-build aliphatic acrylic polyurethane finish coat formulated with additional UV stabilisers for demanding interior and exterior applications.
Designed to provide both a protective and decorative high-gloss finish, the coating offers outstanding colour and gloss stability during exterior weathering, together with excellent flexibility, durability and resistance to water and a wide range of mild chemicals.
When combined with a suitable primer system, PU 55 HB Topcoat provides a durable finishing layer for structural steel, industrial equipment, roofing, flooring and other surfaces requiring long-term exterior protection and appearance retention.
Features & Benefits
- High-build polyurethane technology
Provides effective film build while delivering a durable protective finish. - 2K aliphatic acrylic polyurethane
Produces a tough, crosslinked coating suitable for demanding exterior environments. - UV stabilised
Additional UV stabilisers enhance resistance to prolonged exterior exposure. - Excellent colour retention
Helps maintain colour during long-term weathering. - Outstanding gloss retention
Maintains a high-quality decorative appearance under exterior conditions. - Non-chalking
Resists surface degradation associated with prolonged UV exposure. - Non-yellowing
Supports long-term colour stability, particularly with lighter colours. - Excellent flexibility
Combines film toughness with flexibility for durable service. - Tough and durable
Provides a hard-wearing protective finish. - Fast drying
Supports efficient coating application and reduced turnaround times. - Excellent recoatability
Can be recoated even after prolonged exposure when correctly prepared. - Excellent water resistance
Provides a protective barrier against water exposure. - Chemical resistance
Resistant to mild chemicals and dilute industrial chemicals. - Salt-water resistance
Suitable for applications exposed to saline conditions within the specified service limitations. - Oil resistance
Resistant to mineral and vegetable oils. - Solvent resistance
Resistant to paraffins and aliphatic solvents. - Wide colour range
Available in RAL, NCS, SABS and other matched colours, including metallic and fluorescent options. - Versatile application
Suitable for airless spray, conventional spray, brush and roller.
Intended Uses
PU 55 HB Topcoat is designed as a high-build protective and decorative finish coat for industrial applications where long-term exterior weathering resistance, colour stability, gloss retention and durability are required.
The coating is intended for application over a recommended compatible primer or anti-corrosive system. Together, the primer and polyurethane topcoat form a protective system capable of providing excellent performance in exterior environments while also delivering a high-quality decorative finish.
Its resistance to water, mild chemicals, salt water, mineral and vegetable oils, paraffins, aliphatic solvents, dilute industrial chemicals and aqueous solutions makes it suitable for a broad range of industrial, structural and equipment applications. The coating can also be recoated after prolonged exterior exposure when the existing surface is correctly cleaned and prepared.
Typical Applications:
- Structural steel
- Agricultural equipment
- Earthmoving equipment
- Construction equipment and machinery
- General plant and equipment
- Industrial machinery
- Fabricated steel components
- Roof coatings
- Industrial roof systems
- Floor coatings
- Industrial floors
- Line demarcation
- Wall coatings
- Trafficable surfaces
- UV-resistant flooring systems
- Self-levelling epoxy floors
- Self-levelling polyurethane floors
- UV-protective topcoats over epoxy systems
- UV-protective topcoats over polyurethane systems
- Industrial maintenance
- Equipment refurbishment
- Exterior protective coating systems
The product's ability to function as a trafficable UV-protective topcoat over self-levelling epoxy and polyurethane systems extends its use beyond conventional structural and equipment coatings into industrial flooring applications.
Technical Information:
- Product Type: High-build polyurethane finish / topcoat
- Technology: Two-component, solvent-based aliphatic acrylic polyurethane
- Category: Steel Structure Corrosion Protection – Polyurethane
- Service: Interior and exterior
- Colour: RAL, NCS, SABS and other matched colours
- Special Colour Options: Metallic and fluorescent colours available
- Finish: High gloss
- Density: Approximately 1.3 kg/L
- Volume Solids: 60%
- Mixing Ratio: 4:1 by volume
- Activator: PU Activator 54 AL XL – Component B
- Typical Dry Film Thickness: 50 µm DFT
- Typical Wet Film Thickness: 83 µm WFT
- Theoretical Coverage: Approximately 12 m²/L at 50 µm DFT, before allowance for loss factors
- Application Methods: Airless spray, conventional spray, brush or roller
- Dry Continuous Temperature Resistance: 100°C
- Non-Continuous Temperature Resistance: 120°C
- Pot Life at 25°C: Approximately 4 hours
- Airless Spray Tip: 11–17 thou
- Minimum Airless Pressure: 140 bar / 2000 PSI
- Pressure-Pot Spray Fluid Tip: 1.1–1.6 mm
- Conventional Spray Fluid Tip: 1.1–1.6 mm
- Typical Brush Film Build: 40–50 µm
- Thinner: PU Thinner or Solvent XL
- Thinning: 0–20%, depending on application
- Cleaner: SA65 Thinner
- Minimum Surface Temperature: 5°C or 3°C above dew point
- Maximum Surface Temperature: 40°C
- Minimum Ambient Temperature: 10°C
- Maximum Ambient Temperature: 45°C
- Maximum Relative Humidity: 85%
- Pack Sizes: 5 L and 20 L
- Shelf Life – Part A: Minimum 24 months at 25°C
- Shelf Life – Part B: Minimum 12 months at 25°C
Colours & Finishes
RAL Colours
NCS Colours
SABS Colours
Please Note: Colour swatches and illustrations displayed are only to be used as a guide and can vary from the original.
Documents & Resources
Industrial Protective Coatings
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