Choosing a spray coating for metal roofs requires balancing reflectivity, flexibility, durability, and ease of application. This guide highlights top spray-on coatings that seal, reflect heat, and extend roof life. Each selection is reviewed for performance on metal surfaces, weather resistance, and spray applicability to ensure lasting protection for American homes and facilities.
Summary of Selected Products
- Rust-Oleum Elastomeric Roof Coating – White, 4.75 Gallon
- AMES Maximum Stretch Roof Coating – White, 1 Gallon
- Liquid Rubber Waterproof Sealant – Black, 1 Gallon
- Countryman Coatings 100% Silicone Roof Coating – White, 4.75 Gallon
- RubberTop Roof Coating – White/Elastomeric, 5 Gallon
Rust-Oleum Elastomeric Roof Coating 710 White
Rust-Oleum’s Elastomeric Roof Coating provides a thick, reflective layer designed to extend metal roof life. With high initial reflectivity and weathered reflectivity, it helps reduce heat absorption and contribute to lower cooling loads. The coating resists water intrusion and becomes rain resistant within hours, enabling quicker project completion on large metal roof areas. It’s suitable for flat or slightly sloped metal surfaces and pairs well with other protective roofing products in the Rust-Oleum line.
Key features include an 84% initial reflectivity and 74% reflectivity after weathering, plus a rapid rain resistance window. Application is typically via spray, roller, or brush, depending on project size and texture requirements. For best results, prepare the metal substrate by cleaning and priming as needed, then apply in evenly coated layers to achieve uniform thickness.
AMES Maximum Stretch Roof Coating MSS1 – White
AMES Maximum Stretch Roof Coating is an elastomeric, acrylic, rubberized coating designed for low-slope roofs. It offers up to 650% elongation to resist cracking and peeling, which is valuable on metal roofs that contract and expand with temperature changes. The product features 88% light reflectivity from the bright white finish, helping to reduce surface temperatures and cooling costs. It adheres to metal roofing, tar, rolled roofs, and more, and can be brushed, rolled, or sprayed on.
The coating is positioned as a versatile sealant suitable for RV roofs and other flat or low-slope applications. Its high elongation minimizes microcracking, while the reflective finish reduces heat gain. For best results, ensure a clean, dry surface and apply in multiple thin coats to achieve the desired thickness and performance.
Liquid Rubber Waterproof Sealant – 1 Gallon
Liquid Rubber is a flexible, durable waterproof sealant designed for flat and low-slope roofs, including metal surfaces. It creates a seamless rubberized membrane that protects against water infiltration and withstands building movement due to its excellent elongation (over 950%). The formula resists cracking, peeling, and UV damage, offering long-term protection against weather exposure. Coverage varies by surface and coating thickness, with guidance to apply multiple coats for maximum thickness.
Applications include flat/low-slope roofs, foundations, gutters, and other areas requiring a durable waterproof layer. It can be brushed, rolled, or sprayed, making it a versatile option for DIY repairs or larger sealant projects on metal roofs. The membrane remains flexible to accommodate thermal expansion and contraction.
Countryman Coatings 100% Silicone Roof Coating – White
Countryman Coatings offers a 100% silicone roof coating that adheres to metal and a wide range of roof surfaces. It emphasizes high reflectivity to reduce energy costs and features excellent water resistance and UV stability. The product is designed to deliver strong adhesion without primer in many situations, simplifying application. It is suitable for aging roofs in good structural condition and helps extend roof life by sealing leaks, cracks, and penetrations.
Key advantages include near-90% UV reflectivity, which helps keep the building cooler, and a versatile surface compatibility. It’s appropriate for various roof types, including modified-bitumen, EPDM, and single-ply membranes, making it a flexible choice for mixed roof assemblies. When applying silicone coatings, follow manufacturer guidelines for surface preparation and curing times to ensure optimal adhesion and performance.
RubberTop Roof Coating
RubberTop Roof Coating is a water-resistant, elastomeric coating designed for metal roofs. It combines acrylic and siliconized components to deliver a flexible membrane that reduces interior heat and provides weather resistance. The product is described as easy to apply via spray, roller, or brush, making it accessible for both DIY projects and professional applications. It’s designed to withstand temperature variations and maintain performance over time on metal roof surfaces.
The coating aims to lower interior temperatures by up to 25% and remains durable against heat and cold. For best results, apply in multiple thin coats and ensure the substrate is clean and dry before application. Consider coordinating with ventilation and insulation strategies to maximize energy savings alongside reflectivity and durability.
Liquid Rubber MetalSafe Sealant – 5 Gallon
Liquid Rubber MetalSafe Sealant provides corrosion protection and a waterproof membrane suitable for metal roofs and other exterior surfaces. The formula is designed for fast drying and high-performance UV stability, including the ability to be applied over lightly rusted areas. It can be brushed, rolled, or sprayed with appropriate equipment, enabling flexible application strategies. The 5-gallon size makes it suitable for larger roof areas or multiple projects.
Key considerations include compatibility with existing coatings, surface preparation to ensure adhesion, and the coating thickness needed to achieve the desired membrane. The product is positioned for long-term protection against moisture intrusion and corrosion, especially on metal roofs exposed to challenging weather conditions.
Buying Guide: Key Purchase Considerations
- Roof condition and surface type: Metal roofs vary in coating compatibility. Silicone and elastomeric coatings perform well on metal but may require surface preparation to maximize adhesion.
- Reflectivity and energy savings: Higher reflectivity reduces heat gain. For hot climates, prioritize products with near-white reflectivity ratings and UV resistance.
- Elongation and flexibility: Materials with high elongation resist cracking due to thermal expansion and contraction. Elastomeric and rubberized formulations are advantageous on metal roofs.
- Coating thickness and coverage: Some products require multiple coats for the recommended membrane thickness. Plan for project scope and surface area to estimate quantities.
- Application method: Availability of spray, roller, or brush application can affect labor time and cost. Choose a product that aligns with your preferred method and equipment.
- Primer requirements: Some silicone-based coatings may not require primer, but always verify surface prep steps for best adhesion.
- Durability and UV stability: Look for UV-resistant formulations to minimize degradation from sun exposure and extend roof life.
- Indoor/outdoor suitability and odor: Consider ventilation needs and odor levels, especially for enclosed spaces or sensitive environments.
- Warranty and manufacturer guidance: Review warranty terms and follow the manufacturer’s application guidelines for optimal performance.
In choosing a spray coating for a metal roof, balance the need for reflectivity, elasticity, and ease of application with the roof’s exposure and climate. The selected products cover a range of performance traits—from high reflectivity and elasticity to silicone adhesion and waterproofing—so homeowners can match the coating with their roof’s condition and maintenance goals.