10 Best Metal Roof Sealants 2025 in the United States

The EternaBond RoofSeal White sealant tape stands out for its versatility and ease of use. It bonds effectively to a wide range of surfaces including aluminum, galvanized steel, wood, fiberglass, and various roof materials like EPDM and TPO, making it suitable for multiple uses such as on metal buildings, RV roofs, and boats.

The tape's advanced MicroSealant creates a durable, waterproof, and airtight seal without the need for additional sealing, which simplifies the application process and reduces the need for extra materials. Its flexibility at extremely low temperatures, down to -57°C (-70°F), ensures it remains effective in harsh conditions. Additionally, its excellent UV resistance prevents deterioration from sun exposure, enhancing its longevity and durability.

However, it's important to note that while the one-step process is convenient, the tape's thickness of 35 mils may make it slightly difficult to conform to irregular surfaces. Also, while it is highly effective for sealing, it may not be the best option for users needing a product with a quicker curing time as tapes generally require a bit of pressure and time to adhere properly. This product is ideal for those looking for a long-lasting, multi-use sealant tape that is easy to apply and requires minimal additional tools or materials.

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.