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As a metal roof owner, you really don’t have much to worry about. This roof lasts long, fares well against the harsh weather conditions, and requires much less maintenance than other types of roofs. However, that does not mean that you shouldn’t care for it at all. Over time, even the most durable metal roofs can develop small cracks, holes, or other signs of wear and tear. Left unchecked, these issues can lead to leaks and further deterioration.
That’s where a high-quality metal roof sealant comes in.
In this guide, we’ll explore the types of sealants and the best metal roof sealants on the market in 2024, their key features, and ideal uses. Whether you have a traditional standing seam roof, architectural metal shingles, or corrugated panels, you’ll find the perfect sealant to safeguard your investment.
Types Of Sealants
Silicone Sealants
One of the most versatile and popular options, silicone sealants are ideal for sealing seams, joints, and penetrations on metal roofs. They provide excellent adhesion, UV resistance, and flexibility to expand and contract with the metal. Silicone can be used on various metals like steel, aluminum, copper, and more.
Butyl Sealants
These rubber-based sealants are extremely durable and long-lasting. Butyl adheres tenaciously to metal surfaces, making it great for sealing laps, fasteners, and other critical areas prone to leaks. It remains flexible over a wide temperature range but may require an added primer on some metals.
Acrylic Sealants
One of the more affordable options, acrylic sealants are easy to apply and clean up. They offer decent flexibility and UV resistance for general sealing on metal roofs and flashing details. However, their shorter lifespan may require more frequent reapplication.
Polyurethane Sealants
Known for their strength and abrasion resistance, polyurethane sealants create a robust waterproof seal. They bond well directly to bare metal without a primer. While polyurethane has limited flexibility, it can tolerate moderate expansion and contraction.
Best Sealant Products For Your Metal Roof
Metal roofs are quite durable, but when you live in areas where the weather conditions are severe, like Mississippi or Alabama, it’s better to have an additional layer of protection. This is what a sealant is for. There are a variety of products available, but we have narrowed it down to the five of the best ones.
Liquid Rubber MetalSafe Sealant:
Liquid Rubber’s MetalSafe Sealant is the smart choice for waterproofing and repairs on your metal roof. This high-performance formula creates a seamless, flexible membrane that locks out leaks and shields your roof. What makes MetalSafe stand out is its superior adhesion and durability. You can apply this sealant directly over slightly rusted spots without extensive surface prep.
The sealant stands up well against UV radiation, extreme temperatures, chemicals, impacts, and abrasion, which helps prevent cracking, peeling, and degradation over time.
The sealant has a thick, viscous consistency that allows it to be easily brushed or rolled directly onto the roof in one coat without sagging or running. No mixing is required beforehand. The deep black color provides uniform appearance and hides existing rust spots. Available in convenient 1 or 5 gallon sizes, you can choose based on the size of your metal roof or other requirements.
Gorilla Waterproof Patch and Seal Spray
As the name suggests, this metal roofing sealant from Gorilla is a rubberized spray coating designed to create a flexible, watertight barrier.
What sets this product apart is its unique spray-on application. The adjustable nozzle allows for a controlled spray pattern, enabling you to get an even coat over the desired area. This aerosol spray makes the Gorilla sealant very easy to apply, even in tight spaces or at awkward angles on the roof. Plus, its self-leveling formula helps fill in small holes and splits for a smooth, seamless seal.
Once applied and cured, this metal roof coating exhibits good temperature and UV resistance and will withstand the elements long-term. It also becomes tack-free and paintable if needed, giving you the ability to blend it with the surrounding roof color.
One can is 16 oz, and no extra tools like brushes or rollers are required. Just be prepared to use multiple cans for larger jobs.
Metal Silicone 2® Sealant by GE
Next on our list is a premium sealant for metal roofs that will get the job done right and keep performing year after year: GE’s Metal Silicone 2.
This isn’t like other sealant options – it’s a 100% silicone formula made specifically for all types of metal roofing materials like steel, aluminum, copper, and more. Plus, it will not tarnish the finish of your metal roof.
One standout feature is the 30-minute rain-ready formula, allowing you to seal up exposed areas quickly before inclement weather hits. The sealant also provides 10-year mold-free product protection to help resist mold and mildew growth over time.
Backed by a lifetime guarantee, Metal Silicone 2 provides lasting waterproof protection by forming a flexible seal that expands and contracts with the metal roof’s movements without cracking or separating.
Titebond WeatherMaster Metal Roof Sealant
When tackling roof sealing jobs in harsh weather, you need a sealant that can be easily applied yet still deliver a firm bond. Enter the Titebond WeatherMaster, designed to adhere powerfully to both Kynar-coated and other metal roofing materials.
This versatile sealant can be gunned on with ease, even in extreme hot, cold or wet conditions where other products would struggle. This metal roof sealant also offers excellent adhesion to seams, fasteners, and cracks. Its flexibility allows it to move with the roofing materials as they expand and contract through temperature cycles.
With built in UV resistance and a low-VOC formula, this sealant can withstand constant sun exposure without prematurely degrading or becoming brittle over time.
For tackling detail work on metal roofs, the 9.5 oz cartridge size provides a manageable amount of product. There are over 100 colors to choose from, so painting is often not needed.
Geocel 4350™ Metal Roof & Siding Construction Sealant
To close our list of best sealants for metal roofs is the Geocel 4350 Construction Sealant. This is a flexible sealant that aims to provide a long-lasting, watertight seal without shrinking over time.
According to Geocel, this sealant meets rigorous ASTM C-920 Class 50 testing standards for permanent flexibility, allowing it to stretch and recover with expansion and contraction of the metal materials. This flexibility helps prevent cracking or separation of the sealed area.
One of the key features is the ability to apply this sealant in both wet and dry conditions across a very wide temperature range from 0 degrees to higher temperatures. Not only metal roofs, but this coating is also compatible with glass, brick, wood, and vinyl surfaces. It is available in a standard black color as well as additional options like Cobalt Blue and Radiant Red.
We Can Take Care Of Your Metal Roof!
Worried about how your metal roof is faring against tough weather conditions? Our team at Renova Roofing & Construction is here to help. We offer the best metal roofing services in the area. Whether you want to install a new sealant for your metal roof or need to repair the panels, our experts are equipped with the skills and expertise to do the job.
Contact us today at (601) 647-3433 to learn more.