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.

This Liquid Rubber Waterproof Sealant is designed to create a strong, flexible, and waterproof layer especially suited for metal roofs, flat or low slope roofs, and other surfaces like gutters and foundations. It stands out with excellent adhesion to various materials including metal, concrete, and wood, ensuring a secure bond that resists peeling and cracking.

Its high flexibility (over 950% stretch) means it moves well with building shifts and temperature changes, reducing the chance of damage over time. The sealant also offers good UV resistance, helping protect surfaces from sun damage. Application is straightforward since it can be brushed, rolled, or sprayed on, and its water-based formula is low in odor and safe for use around sensitive materials like foam insulation.

The coverage rate is relatively low, requiring multiple thick coats for full protection, which might increase labor and product costs. It remains somewhat tacky after curing and isn’t suitable for areas with regular foot traffic, so it’s best used on roofs or surfaces where people don’t walk frequently. This product is a solid choice for DIYers or professionals looking for a durable, flexible sealant that performs well on metal roofs and other surfaces needing waterproof protection but may not be ideal if you need a quick application or a sealant for walkable areas.

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.