Description
Eagle CoolTop – White Reflective Two-Component Polyurethane Roof Coating
Eagle CoolTop is a high-performance, white, two-component aliphatic polyurethane coating designed to reflect solar radiation and reduce heat absorption on exposed roof surfaces. It forms a flexible, continuous, glossy protective film that helps reduce the thermal load on buildings and protects suitable roofing systems from prolonged exposure to sunlight and weathering.
With a manufacturer-stated Solar Reflectance Index (SRI) of 105, CoolTop is designed to improve the thermal performance of roof surfaces. It can be used as a reflective protective topcoat over compatible waterproofing membranes, including polyurethane and polyurea systems, as well as suitable existing bituminous, EPDM, TPO and other roofing substrates when correctly prepared.
Key Benefits
- High solar reflectivity: Reflects solar radiation to help reduce heat absorption across exposed roof surfaces.
- SRI of 105: Manufacturer-stated Solar Reflectance Index.
- Reduced thermal loading: Helps reduce roof temperatures and improve internal thermal conditions.
- Flexible protective film: Forms a continuous coating with strong mechanical properties.
- UV resistance: Designed for long-term exposure to solar radiation.
- Standing water resistance: Designed to withstand stagnant water when correctly applied.
- Chemical resistance: Resistant to permanent contact with chlorinated water, salt water and certain acids, subject to manufacturer limitations.
- Algae and mould resistance: Helps maintain a cleaner roof surface.
- Waterproofing system protection: Suitable as a reflective protective topcoat over compatible liquid-applied membranes.
- Multiple application methods: Can be applied by brush, roller or suitable airless spray equipment.
Technical Properties
| Product Type | Two-component aliphatic polyurethane resin |
| Colour | White / reflective |
| Finish | Glossy, flexible protective film |
| Solar Reflectance | 0.84 |
| Thermal Emissivity | 0.87 |
| Solar Reflectance Index (SRI) | 105 |
| Density at 23°C | Approximately 1.20–2.00g/cm³ |
| Dry Extract | Approximately 73% |
| Adhesion to Concrete | Greater than 1.5MPa |
| Application Temperature | +5°C to +35°C |
| Drying Time at 23°C | Approximately 2–4 hours |
| Time Between Coats | Approximately 4–48 hours |
| Pot Life | More than 1 hour |
| Walkable | Approximately 24 hours at 23°C |
| Application Method | Brush, roller or airless spray |
Coverage and Packaging
CoolTop is supplied as a two-component system, with the resin and hardener packaged separately. The components must be thoroughly mixed before application.
| Pack Size | Approximate Coverage |
| 5kg | 20–25m² |
| 20kg | 80–100m² |
Typical application consumption is approximately 200–250g/m² per coat. Actual coverage depends on the substrate, surface texture, porosity and application requirements.
Application Guidance
1. Surface Preparation
The substrate must be dry, firm and suitably prepared. Remove dust, dirt, moss, oil, grease and other contaminants that could affect adhesion. Existing roofing membranes should be inspected, repaired and securely bonded before coating.
2. Primer Selection
Primer requirements depend on the existing roof substrate and the roofing system:
- EPDM, TPO and FPO membranes: UltraPrime CT is specified as a bonding bridge on suitable existing synthetic membranes.
- Smooth bituminous sheets: UltraPrime CT can be used to improve adhesion.
- Mineral-finished bituminous membranes: UltraPrime REG may be recommended to improve surface evenness.
- Polyurethane and polyurea membranes: Follow the manufacturer's preparation and bonding-bridge instructions for the existing membrane system.
- Metal and PVC: Thorough cleaning, preparation and secure detailing of edges and joints are required. Confirm any additional preparation requirements for the particular substrate.
3. Mixing
CoolTop is a two-component product. Mix the resin and hardener thoroughly using a mechanical stirrer until a uniform blend is obtained. Avoid incorporating excessive air during mixing. Observe the product's pot life after mixing.
4. Application
Apply in light, even coats using a brush, roller or suitable airless spray equipment. The manufacturer's technical information gives an application temperature range of +5°C to +35°C. The substrate must be at least 3°C above the dew point, with an ambient temperature of at least 8°C and relative humidity below 80%.
5. Drying and Recoating
At 23°C, the approximate drying time is 2–4 hours, with 4–48 hours between coats. The coating is typically walkable after approximately 24 hours. Actual drying and curing times depend on site conditions.
UltraPrime CT – Recommended Bonding Primer
UltraPrime CT is a two-component, 100% solids epoxy resin designed to improve adhesion within compatible roof coating systems. It is specified as a bonding bridge for suitable smooth bituminous sheets and synthetic roofing membranes, including EPDM, TPO and FPO.
Primer selection must be based on the existing roof substrate and the manufacturer's current application guidance. Not every substrate requires the same primer.
Suitable Applications
- Flat and low-slope roofs
- Commercial and industrial roofing
- Existing bituminous roofing membranes
- Suitable EPDM, TPO and FPO roofing membranes
- Polyurethane liquid waterproofing membranes
- Polyurea waterproofing systems
- Suitable metal roofing structures
- Roofing areas exposed to high solar radiation
- Suitable roof areas requiring a reflective protective finish
- Compatible roof and aquatic waterproofing systems
Frequently Asked Questions
What is Eagle CoolTop used for?
CoolTop is a white reflective polyurethane coating designed to reduce solar heat absorption on roofs. It can also be used as a protective topcoat over compatible waterproofing membranes.
What is the Solar Reflectance Index of CoolTop?
The manufacturer's 2026 brochure states an SRI of 105, measured in accordance with ASTM E903-20.
Can CoolTop be applied over an existing EPDM roof?
Yes, CoolTop can be used over suitable existing EPDM roofing membranes. The membrane must be thoroughly cleaned, inspected and securely bonded. The manufacturer specifies UltraPrime CT as a bonding bridge for suitable existing EPDM, TPO and FPO membranes.
Does CoolTop resist standing water?
Yes. The manufacturer describes CoolTop as resistant to standing water and suitable for flooded roof applications when correctly applied as part of an appropriate system.
Can CoolTop be used as a waterproofing membrane?
CoolTop is primarily a reflective protective coating and is commonly used as the final layer over compatible waterproofing membranes. It should not automatically be treated as a standalone replacement for a waterproofing membrane. Suitability depends on the substrate, roof construction and manufacturer's system requirements.
How much CoolTop will I need?
A 5kg pack covers approximately 20–25m², while a 20kg pack covers approximately 80–100m². Coverage is based on typical consumption of 200–250g/m² per coat and will vary with the substrate and application.
How long does CoolTop take to dry?
At 23°C, the manufacturer's brochure gives an approximate drying time of 2–4 hours. Recoating is generally between 4 and 48 hours, with the coating typically walkable after approximately 24 hours.
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Important: Clever Shield supplies products only and does not design or specify roofing or waterproofing systems. The project designer or installer is responsible for confirming substrate compatibility, preparation, primer selection, application requirements and system suitability. Always follow the latest manufacturer technical documentation and safety instructions.
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