The Best Sealant for Metal Roofing Top 15 in 2021 (Reviews & Guide)

Metal roofs are prone to cracks and rusts between holes and seams. Hence, an investment in the best sealant for metal roofing offers a reliable solution to restore your metal roof without spending in excess. Metal roof sealants are cost-effective remedies for fixing and repairing roofs, reducing cold and heat caused damages and extending your roof’s lifespan. Besides use on old roofs, the products are ideal for enhancing the durability of new roof surfaces. Below is our pick of the best sealant for metal roofing ideal for sealing metal roofs for reliable, durable, and flexible performance.

Factors to Consider Before Buying Sealant for Metal Roofing

 Weather Resistance

The most important factor to consider before buying a sealant is how reliable it will perform against harsh weather conditions. Since the products are meant for use on the roof, they will be exposed to constant temperature fluctuations. It will be cold at some point, and at other times, the temperature will be hot. Hence, the sealant must have a higher weather protection range. In fact, the higher the resistance rating, the better performance it will deliver. Apart from this, you should also check for mold and mildew resistance. The secret is to look for as many resistance features that will ensure reliable performance on a single product.

 Ease of Use

Apart from resistance, the sealant must also be easy to use. Flexible application design increases the chances of applying the sealant yourself without paying for help. By implication, you can reduce the cost of hiring handymen and use it for something else. All the products above and many others come in spray cans, tape wraps, etc. that encourages flexible application. Spray cans let you reach corners and hard to reach areas without stress. However, the content is often thinner than cans that work with caulk guns. You can also buy tape sealant since they have excellent adhesion strength. However, cutting with scissors can be a pain since the sealant attaches easily. Whatever the design, there is always good and buy-side. However, the decision to buy should be based on preference.

 The Sealant Materials

Roof sealants are made from different materials to increase bonding capabilities. We recommend you check whether the material will adhere to your roof surface or not before buying. You need to check the durability, flexibility, and eco-friendliness of the product to ensure safe and reliable usage. Since you intend to use the product outside, it must be durable and flexible without losing strength regardless of the passage of time.

 Energy-saving Features

Reflective sealants save more energy than the non-reflective types. This means that, although there is a higher temperature outside, the sealant does its part of maintaining low heat on your roof. Hence, it will require less energy to keep your room comfortable. Plus, breathable sealants bond without letting water through. However, it lets vapor through to protect your roof from moisture.

Top 15 Sealant for Metal Roofing

Gorilla Waterproof Patch & Seal Tape 4″ x 10′ Black, (Pack of 1)

The Gorilla Waterproof Patch & Seal Tape 4″ x 10′ Black is an ideal sealant for roofing since it creates a permanent bond. As a result, it seals out water, moisture, and air for lasting performance. Although it is recommended for indoor and outdoor use, the product is best used in areas that are exposed to harsh weather conditions. Besides, it works underwater; hence, it won’t be damaged if used for roofing. The product has an extra thick layer with UV-resistant backing for sturdy outdoor performance. It is also flexible and will conform to the shape of the surface of use with ease. By implication, the product is handy for fixing gaps, tears, cracks, and holes.

Pros 

• Thick adhesive layer
• UV-resistant backing
• Flexible tape

Cons 

• The tape cannot be repositioned once applied

EternaBond RSW-4-50 RoofSeal Sealant Tape, White-4″ x 50′

Create a close-to eternal bond with the EternaBond RSW-4-50 RoofSeal Sealant Tape. As the name implies, the sealant is ideal for creating a lasting bond and sealing cracks. The tape is white and measures 50ft in length and 4-inches in width. As a result, you can cover large areas with one product. It has a stable UV backing for use in sunny environments. It also contracts and expands with changing conditions and can be adjusted to fit certain objects. The sealant features a micro sealant technology formulated with thermoplastic and non-curing rubber. It also comes with a built-in primer and silicone lining to prevent it from sticking to unwanted surfaces before use.

Pros 

• Simple installation
• Easy to cut to size
• Clean finish

Cons 

• Not easy to remove since it’s a permanent sealant

Gorilla Clear 100 Percent Silicone Sealant Caulk

Guarantee optimal protection for your roof with the Gorilla Clear 100 Percent Silicone Sealant Caulk. The product is an extremely versatile sealant with a ready to use time of 30 minutes. Not just this, but it is also mold and mildew-resistant. Thanks to its waterproof properties, you can use it on the roof without fear of water damage. The sealant has a clear color that won’t shrink or color with time. However, to get the best result, you should clean the surface before applying the sealant. Another unique feature of the product is its packaging and design. The sealant’s design is such that you can cut the tip and apply it with a caulking gun. Hence, it is easy to apply without much stress.

Pros 

• Waterproof
• Mold and mildew-resistant
• Won’t yellow with time

Cons 

• Some buyers complained of a toxic and migraine-causing smell

GE Sealants & Adhesives GE112A All Purpose Silicone 1 Sealant, 10.1oz, White

The GE Sealants & Adhesives GE112A All Purpose Silicone 1 Sealant is another waterproof sealant you can use on the roof. It has a permanent flexible design that is shrink and crack-proof. It also offers superior adhesion that can only be rivaled by a few products in the market. The waterproof formula protects from water for a reliable seal in weather and water-prone areas. It also protects against mildew growth and stain-causing molds. Whether for indoor or outdoor use, the product is flexible to use and remains flexible after application. However, do note that it is best used for areas that you won’t paint since it is non-paintable. Nonetheless, it offers reliable protection from UV degradation and freezing temperatures.

Pros 

• Same-day rain-ready design
• 7-year mold-free protection
• Flexible and strong adhesion

Cons 

• Not recommended for use in areas you would like to paint

Permatex 81158 Black Silicone Adhesive Sealant, 3 oz. Tube, Pack of 1

The Permatex 81158 Black Silicone Adhesive Sealant, like many we have reviewed above, is a general-purpose sealant for outdoor and indoor use. It mends, secures, repairs, and bonds glass, metal, vinyl, and fabric. You can apply the sealant to vertical and horizontal surfaces without fail, and it stays flexible and waterproof. The sealant is water, weather, oil, grease, and vibration-resistant. It is also sensor-safe, and the odor is not toxic. However, we recommend you protect your eyes and nose during use. Unlike many that become rigid, the sealant becomes solid but stays flexible.

Pros 

• Comes off clean without residue
• Dries quickly
• Stretches

Cons 

• The tip applicator is a little too long and can cause wastage

 J-B Weld 31310 All-Purpose RTV Silicone Sealant and Adhesive – 3 oz. – Clear

J-B Weld 31310 All-Purpose RTV Silicone Sealant and Adhesive is a general-purpose adhesive designed for household and mechanical use. Not that we are any surprised coming from a brand that has been around for more than 40years. The sealant is easy to use and forms a touch shield against mildew and mold. It is also weathering-resistant and won’t crack and shrink. Plus, it is a product that encourages DIY as it is easy to apply. The product package includes an applicator tip for convenient application.

Pros 

• Easy to use
• Durable and versatile
• Flexible with incredible grip

Cons 

• The nozzle sometimes clogs up

Transparent Duct Tape, Ultra High-Performance Weather Resistant

It doesn’t look too much, but the Transparent Duct Tape, Ultra High-Performance Weather Resistant has earned its place on our list of the best sealant for metal roofing. The tape by Gaffer Power has a transparent design and is strong and versatile. As a result, it goes on easily and won’t appear out of place. Although it is a see-through type, it is designed to put up a reliable performance against storms, rain, and humidity. It is strong and easy to work with. Plus, the tape comes with a biaxially-oriented propylene backing for easy tearing and use. If you are a fan of made in US products, you should know that the tape is made in the US with quality materials.

Pros 

• US quality tape
• Powerful and tough adhesion
• Weather-resistant

Cons 

• It will occasionally stick to the scissors while cutting

GE Sealants & Adhesives GE500 Advanced Silicone 2 Window & Door Sealant

Although recommended for doors and windows, the GE Sealants & Adhesives GE500 Advanced Silicone will work sealant for metal roofing . It features a 100% silicone formula that offers sturdy protection from damages caused by water. As a result, it ensures a reliable seal in water-prone areas. The product has a 40% more flexibility rating than similar products and has five times more adhesion. Hence, it will stay flexible with strong adhesion for durable use. It is also designed to withstand extreme contraction and expansion linked to temperature fluctuations.

Pros 

• Won’t blemish metals
• Sun and freeze-proof
• Flexible and strong adhesion

Cons 

• Some buyers received leaky products

Patch & Shield Power Tape Clear – All Weather Patch Tape | Stretchy Sealing Tape for Roofing

The all-weather patch tape is another product by Gaffer Power that is ideal for forming stretchy seals on roofs. The product is a flexible tape with a professional-grade sealing result for long and short term use. Since it is 4-inches wide, it is perfect for sealing roof patches, nail hole leaks, and patches. The tape is designed to hold water; hence, it won’t give in to rainwater on the roof. The tight seal created by the tape increases with pressure, and the product features an adhesive backing that holds to any surface under any condition.

Pros 

• Made in the USA
• Premium grade tape
• Easy to cut

Cons 

• The package does not come with instructions

Rust-Oleum 265494 Leak Seal Flexible Rubber Sealant, 12 oz, Black

Our best sealant for metal roofing review will be incomplete without including one by Rust-Oleum. The brand is one of the market’s best, and its quality product is evident in the Rust-Oleum 265494 Leak Seal Flexible Rubber Sealant. The product provides waterproof protection from corrosion, moisture, and rust. It features an advanced rubberized formula that is easy to spray for even application. Unlike many, the product comes in a spray can that lets you apply and use it in different directions. Plus, it lets you cover hard-to-reach areas without help or stress. More importantly, though, it creates a watertight barrier for sealing cracks and leaks.

Pros 

• Flexible seal
• Easy to use
• Oil-based formula

Cons

• It sprays a bit thinner than some buyers hoped

Flex Seal Spray Rubber Sealant Coating, 14-oz, White (2 Pack)

The Flex-Seal Spray Rubber Sealant Coating is another spray sealant that encourages flexible and simple DIY applications. The product package contains two sprays; hence, you can match what others will offer for two with one purchase. Apart from the convenient application, the sealant is paintable and seeps holes and cracks. It also dries to a watertight state and forms a rubberized and flexible coating. Plus, it protects from corrosion and can be used on dry and wet surfaces.

Pros 

• Won’t sag in the summer heat
• Flexible and pliable
• Paintable

Cons 

• Some buyers wished the product was thicker

3M Aluminum Foil Tape 3340, 2.5″ x 50 yd, 4.0 mil, Silver

The 3M Aluminum Foil Tape 3340 is a vapor seal tape with foil backing and strong pressure-sensitive adhesive. Thanks to this combination, it gives the tape a unique operational temperature range for reliable performance. A poly-coated kraft paper liner keeps the tape for use by protecting the adhesive. The foil backing also works as a barrier against dust, chemicals, and moisture. As a result, the product is a strong, durable, and lasting tape for different applications. See more best paint for your cast aluminum.

Pros 

• Thermally conductive backing
• Long service life
• Withstands cold and hot temperatures

Cons 

• It can be challenging to separate the backing from the tape

Loctite PL S30 Black Roof and Flashing Sealant 10-Fluid Ounce Cartridge (1618181)

The Loctite PL S30 Black Roof and Flashing Sealant offer premium quality and commercial-grade sealing for permanent adhesion. It seals and forms permanent and waterproof seals on joints and gaps. Thanks to the product’s design, the sealant is elastic and stays flexible for contract and expansion with your roof’s movement. It also provides permanent flexibility, corrosion-resistant, and non-sag properties to retain the roof’s original seal. The product requires no primer and is weather-resistant. Plus, it is ozone and UV-resistant; hence, it won’t soften in the sun.

Pros 

• Blends with surroundings
• Paintable
• Low-VOC formula

Cons

• Content sometimes cures and block the nozzle

Dap 08660 9.8 oz. Commercial Kitchen 100% Silicone Sealant, Stainless Steel

The Dap 08660 9.8 oz. Commercial Kitchen 100% Silicone Sealant is easy to use and has greater consistency than regular caulk. Although it comes with a concentrated smell, the sealant is adhesive and offers watertight protection. Plus, it is white; hence, it won’t stand out obnoxiously on your project. Besides, since it is designed for use on the roof, you don’t need to bother so much about the color. The product is NSF certified and holds up great in the sun.

Pros 

• Durable with great adhesion
• Airtight and fast sealing
• Sleek black color

Cons 

• After-use cleaning is a bit challenging

High-Temp Silicone Sealant, 10.3 fl. oz. Cartridge

High-Temp Silicone Sealant is another unique product with a simple yet functional design. The high-temperature sealant is great and holds up well against heat. As a result, you can use it on the roof without bothering so much about damage from the sun. Besides used for roofing, the product is a general-purpose sealant that will work with almost any clean and porous surface. It flows well, and the VOC is low. Plus, it has a great consistency, and you can apply and spread it with a wood applicator. When it is dry, it dries to a shiny black coating.

Pros 

• Non-flammable with fast curing
• Insulates thermally and electrically
• USDA-approved

Cons 

• Not for unpainted galvanized metal

Conclusion

That is a wrap on our best sealant for metal roofing review. If anything, buying the best products goes beyond a good intention to make a valuable purchase. We have reviewed the market’s best products to help you get the best from your purchase. In case you have been burned once, you can go through our buyer’s guide to make your next purchase worth your while. We don’t have a favorite product since each person has peculiar needs. Hence, feel free to make you pick from the products above.