Black Jack Elasto-Kool 700 is a premium elastomeric roof coating designed to protect and extend the life of flat and low-slope roofs. The white formula reflects sunlight, helping reduce cooling loads and energy costs. This article examines its composition, performance, application guidelines, and how it compares with other white roof coatings in the market.
Product Overview
Elasto-Kool 700 is a high-build, elastomeric coating formulated to seal and waterproof roof surfaces while offering excellent elongation and flexibility. The white finish provides high solar reflectivity, contributing to a cooler indoor environment and longer roof life by minimizing heat-related damage. The product is typically used on roofs made from concrete, asphalt, metal, and built-up assemblies, making it a versatile option for many commercial and residential applications.
Key Features And Benefits
Elastomeric Flexibility: The coating remains flexible through temperature extremes, forming a durable membrane that resists cracking and UV degradation. Cool Roof Benefits: The white pigmentation reflects solar radiation, reducing rooftop temperatures and potentially lowering air-conditioning costs. Water Resistance: The coating provides a seamless, waterproof barrier that helps prevent leaks and moisture intrusion. Durability: It resists wear from foot traffic and weathering, extending roof life when properly applied.
Technical Specifications
| Property | Specification |
|---|---|
| Color | White |
| Form | Liquid elastomer with high solids |
| Typical Coverage | 75–125 sq ft per gallon per coat (varies by surface and porosity) |
| Recommended Coats | 2 coats for most applications |
| Temperature Range (application) | 50°F to 90°F (minimum surface temp 5–10°F above dew point) |
| Dry Time (to touch) | 2–6 hours, depending on conditions |
| Curing Time (rehardening) | Full cure 3–7 days |
| VOC Content | Low to moderate (check current MSDS) |
Preparation And Application
Proper surface preparation is critical to maximize adhesion and performance. Clean the roof to remove dirt, dust, grease, and loose particles. For concrete, repair cracks and seal any joints before coating. For metal roofs, remove rust and apply appropriate primers if recommended by the manufacturer. Ensure the surface is dry and free of standing water.
Mixing is important: stir thoroughly to achieve a uniform consistency. Apply with a brush, roller, or airless sprayer designed for elastomeric coatings. A second coat is typically required to reach the desired build and sealing performance. Maintain even thickness across the surface to avoid sags and pinholes. Use protective equipment and ensure adequate ventilation when applying indoors or in enclosed spaces.
Coverage, Curing, And Performance
Actual coverage depends on substrate porosity, texture, and the number of coats. Dry weather and ambient temperatures between 50°F and 90°F promote optimal curing. On rough or highly porous surfaces, expect closer to the lower end of the coverage range. Two coats deliver better waterproofing, elasticity, and longer-term durability than a single coat.
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After application, the coating will dry to a rubber-like membrane. It is important to avoid heavy foot traffic until fully cured, typically after 24–72 hours depending on humidity and temperature. In regions with significant temperature swings, the elastomeric layer should maintain flexibility without cracking or losing adhesion.
Maintenance And Troubleshooting
Periodically inspect the roof for areas where the coating has worn thin or blistered. Promptly repair any damage to prevent leaks. If blisters or pinholes appear, assess surface prep and consider recoating with the recommended number of coats. If poor adhesion is observed, check for moisture, surface contamination, or insufficient surface roughness. In high-traffic zones, reapplication may be necessary sooner to maintain waterproofing.
Safety, Environmental Considerations, And Storage
Follow all safety instructions on the product label and MSDS. Use gloves and eye protection during installation, and ensure proper ventilation. Store containers in a cool, dry place away from direct sunlight and heat sources to preserve product integrity. Elasto-Kool 700 should be disposed of according to local regulations for roofing materials and solvents.
Comparisons And Applications
White elastomeric roof coatings like Elasto-Kool 700 are favored for flat and low-slope roofs in the United States due to their reflective properties and durability. Compared with concrete or asphalt-based coatings, elastomeric formulas usually offer superior elongation, sealing, and weather resistance. When meta-criteria include UV stability, energy efficiency, and long-term maintenance, Elasto-Kool 700 remains a common choice for commercial buildings and some residential flat roofs.
Tips For Optimal Results
- Confirm substrate compatibility before application to ensure proper adhesion.
- Apply during a period of dry weather with temperatures above 50°F.
- Use the recommended primer if advised by the manufacturer for challenging substrates.
- Apply evenly in multiple coats to achieve uniform thickness and waterproofing.
- Inspect after heavy rainfall to identify and address any uncovered or thin areas.