10 Best Metal Roof Sealants 2026 in the United States

The Henry Pro Grade 988 Silicone White Roof Coating appears to be a robust option for sealing metal roofs. One of its standout features is its rapid curing time, being rain safe in just 15 minutes, which is beneficial for areas with unpredictable weather. Additionally, its high solids content allows for a single coat application, making the process less time-consuming and labor-intensive.

The permanent ponding water resistance is a significant strength, ensuring long-term durability even in areas prone to water accumulation. The product's superior UV resistance and reflectivity help protect the roof and potentially reduce cooling costs. The Henry Pro Grade 988 is also NSF P151 approved for rainwater catchment, adding an environmental and practical benefit for water reuse systems.

It is low odor and VOC compliant, making it safer to use in various jurisdictions with stringent regulations. The application method is straightforward with a 4.75-gallon pail, and the white and black color options offer some versatility in aesthetics. However, the product is relatively heavy at 56 pounds, which could make handling more challenging during application.

The Ames Maximum Stretch is a highly versatile waterproof sealant membrane designed for a variety of surfaces including roofing, concrete, EPDM, and wood. One of its standout features is the 650% elongation, which makes it extremely flexible and resistant to cracking and peeling. This flexibility is a major strength, ensuring that it can handle the natural expansions and contractions of roofing materials without damage.

In terms of adhesion, it performs well on metal roofing, tar, and rolled roofs, making it suitable for various applications including RV roofs and low-slope roofs. The product also boasts a high light reflectivity of 88%, which helps reduce surface temperatures and potentially lowers cooling costs, an added environmental and economic benefit. It is non-toxic, eco-friendly, and low in VOCs, making it safer for both the user and the environment.

However, at 50.1 pounds per 4.6-gallon pack, it is quite heavy, which could make handling and application a bit challenging for some users. While it is designed for easy application by brush, roll, or spray, beginners might still find it a bit difficult to use without prior experience. The Ames Maximum Stretch is a robust and flexible sealant ideal for various roofing maintenance tasks, but its weight and potentially challenging application could be minor drawbacks.

The Gardner-Gibson Sta-Kool 15-Year Turbo-Dri Elastomeric Roof Coating is a flexible, white acrylic sealant designed especially for metal roofs and outdoor surfaces like RVs. It stands out with its quick drying time—becoming rain-safe in just 30 minutes and fully curing in about 3 hours—allowing for faster project completion and protection from sudden weather changes.

This roof coating offers strong UV resistance thanks to its reflective white finish and specialized 'cool-core' pigments, which help keep interior spaces cooler and reduce cooling costs. Its elastomeric nature means it can stretch and flex with roof movements without cracking, which is important for durability over time. Application is straightforward with a roller, making it accessible for both professionals and DIY users.

While it’s water resistant and likely waterproof, the product description does not explicitly guarantee full waterproofing, which may be a consideration for users in very wet climates. Additionally, at nearly 60 pounds per 5-gallon can, it can be heavy to handle during application. This coating is suitable for those seeking a long-lasting, reflective coating that protects against heat and UV damage while providing strong adhesion and flexibility on metal and similar roof surfaces.