Metal roofs are becoming a popular alternative to traditional asphalt roofs. They provide durable protection and can last up to 50 years with minimal maintenance. Metal roofs from materials that contain up to 60% recycled content to support sustainability goals. They also reflect heat efficiently in hot climates, helping conserve energy.
Over time, exposure to harsh heat, chemicals, salt, and moisture can degrade metal roofs and weaken their structural integrity. High-performance coatings are critical for protecting metal roofs from damage and preserving their appearance.
Choosing the right metal roof coating system is essential to ensure durable protection, long-lasting aesthetics, and energy savings. Learn about the different types of metal roof coating systems, the features to look for, and how to select the right one for your project.
Common Types of Metal Roof Coating Systems
A variety of coatings are commonly used for metal roofs, including acrylic, polyester, and fluoropolymer-based options. Understanding the key properties and benefits of each coating can help you select the best option for your project.
Fluoropolymer Coatings
Fluoropolymer coatings are widely recognized for their long-term durability, color retention, and resistance to weathering. These systems are often specified for architectural applications where both performance and appearance are critical over extended service life. Selection between fluoropolymer systems typically depends on application method, substrate, and whether the coating is applied in a factory-controlled environment or in the field.
FEVE Coatings
Fluoroethylene vinyl ether (FEVE) coatings are thermoset fluoropolymer systems that offer a combination of durability and application flexibility. Unlike many high-performance coatings, FEVE systems can be applied both in the factory and in the field.
Key benefits include:
- Strong resistance to UV radiation, chemicals, and environmental exposure
- Excellent color and gloss retention over long periods
- Compatibility with spray, roller, and brush application methods
- Ambient curing without the need for high-temperature baking
These properties make FEVE coatings well-suited for both new construction and restoration projects, particularly where field application is required. In accelerated weathering studies, FEVE systems have demonstrated significantly improved durability compared to conventional urethane coatings. According to accelerated weathering tests, FEVE coatings last five times longer than acrylic urethanes.
Acrylic Coatings
Acrylic coatings are affordable and provide strong resistance to ultraviolet (UV) radiation. They provide a hard, glossy finish that helps protect metal roofs from corrosion. However, acrylic coatings degrade when exposed to constant moisture. As a result, they work best when applied to sloping metal roofs with good drainage.
Polyester Coatings
Polyester coatings are cost-effective and provide durable resistance to corrosion and weathering. However, they offer limited UV protection and degrade quickly when exposed to sunlight, causing coatings to chalk, fade, and peel over time. As a result, polyester coatings require more frequent recoats and maintenance.
Which Key Features Should You Consider in Metal Roof Coatings?
High-performance coatings are critical for protecting metal roofs from damage and maintaining their appearance over time. When choosing a metal roof coating system, consider these key properties to ensure long-lasting performance, durability, and aesthetic appeal.
Effective Corrosion Resistance
Over time, exposure to moisture, oxygen, and salt can cause metal roofs to corrode. Corrosion can weaken metal panels and create holes, cracks, or leaks in the roof’s surface. It can also cause rust to spread, leaving behind patches of discoloration. High-performance coatings are critical for maintaining the integrity and appearance of metal roofs.
When selecting a coating system, look for formulations that provide durable protection against corrosion, such as FEVE-based systems. These coatings prevent harsh elements from penetrating the topcoat and degrading the zinc-rich primer underneath. In an accelerated weathering test, FEVE urethane showed superior resistance to salt spray compared to other coatings.
Electrochemical Impedance Spectroscopy
Lasting Color and Gloss Retention
Durable coatings are essential to maintain the appearance of metal roofs. Consider coating systems that maintain vibrant colors and gloss resistance to discoloration, chalking, and fading. Advanced systems like FEVE and other fluoropolymer coatings deliver excellent color retention, protecting pigments from fading when exposed to sunlight. These coatings extend the lifespan of metal roofs, reducing the need for recoats.
Bob Ruff, technical director at All-Tech Decorating Company, highlights the longevity of FEVE coatings. “FEVE coatings work too well. Once I use them to paint a building, I don’t get to paint it again,” he said. “They’re a high-performance coating that provides the durability you need.”
Listen to: Advanced Coating Application: Insights from a Contractor
Fast Curing and Simple Field Application
Metal roof panels often contain baked-on factory coatings, which degrade quickly outdoors. They are prone to red rust corrosion and lose adhesion over time. Because factory coatings are baked on, field application is typically required for restoration. The metal panels must be stripped of the previous coating, cleaned, and sprayed on-site.
FEVE and acrylic systems are ideal options to replace factory roof coatings. They can be easily applied in the field with brush, roller and spray methods. These coatings also cure quickly at ambient temperatures, eliminating the need for specialized equipment and high heat. The streamlined application and curing process saves time during maintenance.
Enhance Metal Roof Coatings With LUMIFLON FEVE Resins
AGC offers LUMIFLON® FEVE resins designed to enhance the durability, aesthetics, and performance of metal coatings. LUMIFLON-based coatings deliver exceptional resistance to UV radiation, corrosion, and weathering. In field applications, FEVE systems retain color and gloss for more than 35 years, reducing the need for maintenance and recoating.
Choosing the Best LUMIFLON Grade for Your Application
LUMIFLON FEVE resins are available in a variety of grades to meet precise specifications. These advanced resins protect metal substrates and extend the lifespan of metal roofs, reducing maintenance needs.
- LUMIFLON LF-710F resins: Designed for powder coating applications, these resins extend the lifespan of metal roofs. High-performance powder coatings based on LF-710F resins can be formulated to meet AAMA 2605 requirements, supporting demanding architectural applications. These systems also provide flexibility across a full gloss range, from matte to high gloss, enabling a variety of aesthetic finishes.
- LUMIFLON FE-4300 resins: These water-based acrylic blends can be applied in the field with brush, roller, and spray techniques and then air dried. Coatings formulated with these grades provide excellent corrosion resistance and durability for metal substrates such as steel and aluminum. In accelerated weathering tests, FE-4300 grades have been shown to exhibit superior weathering performance compared to other materials under South Florida conditions.
LUMIFLON FE4300/Acrylic Blends South Florida Weathering
AGC works closely with coating formulators to select the best LUMIFLON grade for each project. Whether your goal is to reduce costs, improve weatherability, or prevent corrosion, our experts can help you achieve optimal results. Contact us to learn how LUMIFLON FEVE resins can enhance your metal roof coatings.