Elastomeric Metal Roof Coatings

The longevity of a roof coating depends on the specific chemistry and application system chosen. Acrylic coatings like SolarEx 300 last 10–15 years when properly applied, while TropEx 310 is specified for 10-year systems. Premium silicone coatings such as SiliconEx 500 offer manufacturer warranty options up to 20 years, providing long-term resistance to weathering, ponding water, and thermal movement.

The best roof sealer depends on your roof's condition and slope. For roofs subject to standing or ponding water, 100% silicone sealers like SiliconEx 500 provide a seamless, hydrophobic moisture-cure barrier that permanently resists ponding. For sloped metal roofs needing crack bridging, dirt pickup resistance, and high elongation, water-based elastomeric acrylic coatings like TropEx 310 deliver ASTM D6083 compliant protection.

The ideal coating depends on environmental conditions and performance requirements. 100% silicone coatings offer solvent-free, single-component waterproofing with superior ponding water resistance and long-term durability. High-grade acrylic elastomeric coatings provide excellent elongation, tensile strength up to ~310 psi, and solar reflectance to reduce heat absorption. Both options restore metal roofs effectively when applied over properly prepared surfaces.

Acrylic elastomeric coatings like TropEx 310 provide crack-bridging flexibility with 125% elongation and tensile strength around 310 psi to accommodate metal thermal expansion. In addition, water-based acrylic systems offer low VOC content, dirt pickup resistance, high solar reflectivity (0.83 initial), and compliance with ASTM D6083 standards, making them an economical choice for restoring commercial metal roofing systems.

Silicone coatings are solvent-free and moisture-cured, providing permanent resistance to ponding water and hydrophobic weather protection backed by up to a 20-year warranty. Acrylic coatings are water-based and low-VOC, offering high reflectivity, dirt pickup resistance, and cost-effective restoration for well-drained metal roofs. Silicone is preferred for flat or low-slope sections, whereas acrylic excels in standard sloped commercial recoating.

Elastomeric roof coatings are designed for straightforward application using a commercial airless sprayer, roller, or brush. For high-volume projects, heavy-duty airless spray equipment operating at 3,000 PSI or higher is recommended for uniform coverage. Coatings are available in 5-gallon pails, 55-gallon drums, and bulk pallets to accommodate various project sizes and contractor requirements.