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.

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.