We tried fixing the broken metal roofs with sealants from different brands to find their durability and efficiency.
It turned out most of the companies are just promising over roof fixing.
Here are the top 10 products to help you find the best sealant for the metal roof leak.
Roofs get influenced by extreme weather. Regardless of how you have designed your roof, exposure to sun, hail, snow, and rain will degrade the roof’s condition.
Once the damage is done, small leaks and penetrations will build the moisture, resulting in expensive damage. This is why fixing the leaking metal roof is a good decision.
Table of Contents
Best Sealant For Metal Roof Leak (Top Picks):
Let’s take a closer look at the top ten best sealants for metal roofs. You can repair the damage without spending an arm with the right product.
Liquid Rubber Color Waterproof Sealant
Usable on sloped roofs and planter boxes
Rubber seal Protective Coating
Works on metal roofs
Liquid Rubber RV Roof Coating
Can be used on multiple materials
Liquid Rubber Peel and Stick Seam Tape
Perfect for tears, copings, flashings, and gutters
Gorilla Waterproof Patch & Seal Tape
Seal tape repairs holes, gaps, cracks, and tears
Liquid Rubber Waterproof Sealant
It has firm grip and prevents adhesion failure
It provides support to minor cracks and holes
Loctite Black Roof and Flashing Sealant
It is elastic and remains flexible throughout the material movement
Tuff-Gard Waterproof Coating
It can fill cracks
It resists bacteria and mold
1. Liquid Rubber Color Waterproof Sealant
The first on our list is Liquid Rubber Color Waterproof Sealant. This product is indeed a great sealant specially formulated for metal roofs.
As mentioned earlier, metal roofs are not easy to repair, and one wrong product can lead to other damages—a hard-to-beat product, a water-based formula that is easy to apply.
We love that it is effortless to apply this product; take a brush, roller, or sprayer and apply it to the affected area.
When the solution dries, it turns into a thick rubber membrane that holds the moisture. Not to mention, this product also prevents UV rays.
Moreover, the solution creates a barrier against pooling water.
- Not just clear, but you will get this sealant in various colors.
- You can also use this product on sloped roofs and planter boxes.
- One gallon covers around 30 square feet.
- This sealant is safe around kids and pets.
However, we did not like the only thing—this sealant is limited to particular materials.
- The application process is easy
- The drying time is quick
- You can get this sealant in a variety of colors
The sealant once dried creates bubbles on the surface
2. Rubber seal Protective Coating
Metal roofs are indeed technical. Whether you are finding a problem or finding a solution to a problem is not an easy task.
Rubber seal protective coating sealant is another excellent product for metal roofs.
When it comes to ponding water or crack, this product stands out. Moreover, compared to Liquid Rubber sealant, this product is odorless and dries faster.
The protective membrane of this sealant is robust and virtually impenetrable to standing water.
Most importantly, this unit provides high solar reflectivity that keeps your roof cool throughout the summer.
In addition to this, the spread rate of this sealant is 60 square feet per gallon.
This sealant is not a water-based formula; it is a pure solvent-based formula—applicable with a brush.
- This unit resists moisture absorption.
- It contracts and expands as per substrate movements.
- This product retains flexibility.
- The spread rate is appealing.
However, we will not recommend you to use a sprayer because of the thickness of the solution.
- It is an odorless sealant
- This sealant will keep your roof cool throughout the season
- You can easily apply it with a brush
- The sealant is thick in texture
3. Liquid Rubber RV Roof Coating
A leaky metal roof can cause extensive damage to the interior, and it is essential to repair a roof once you know that there is a problem. Next on our list is Liquid rubber Roof coating sealant.
This product will not only protect your roof—it will also save you from costly damages.
Moreover, you can apply this liquid rubber coating when you want to control the temperature of your roof.
The rubber member is highly flexible and contracts and expands with substrate movement.
Compared to Liquid rubber color waterproof sealant, the spread rate of this Sealant is attractive. One gallon can cover 50-55 square feet.
The water-based formula is easy to apply; either a brush or a sprayer can apply it to the affected areas. However, if you are covering the whole roof, use a roller.
- This product offers protection from solar reflection.
- The final covering has over 1000% elongation that prevents adhesion failures.
- You can use this product on multiple materials.
- No need to apply thick coats.
- No need to apply a primer
- It protects the roof from UV exposure
- The mixture is not too thick or thin
- It takes a lot of time to dry
4. Liquid Rubber Peel and Stick Seam Tape
Next on our list is a unique product for metal roofs. You must have heard about the sealant tapes; let us give you a walkthrough of the best sealant tape as well.
Liquid rubber peel and stick seam tape are commendable sealants that work like magic.
Most importantly, consider getting this product if you are looking for something to prevent small roof leaks. This works wonders for the metal roofs as you can seal the affected area all at once.
The covering is a 2-inch wide strip with a strong adhesive back that sticks to metal, rubber, shingles, etc.
There is no need to apply any additional tools or any other sealant to provide an extra layer of protection.
However, just like other sealants, you cannot use this product on the whole roof. But, it is a perfect solution to small cracks, holes, and other minor damages.
- This product is perfect for tears, copings, flashings, and gutters.
- You can use this product on a variety of materials.
- No need to use any other product for extra safety.
- Instant solution to minor cracks and holes.
The best part about this sealant is that it does not have an expiration date when you apply. It will last a long time!
- No need to prime the surface beforehand
- It can be used to seal the gutters too
- No need to apply a coating of any other sealant
- It is not entirely water resistant
5. Gorilla Waterproof Patch & Seal Tape
Next on our list is Gorilla waterproof patch and seal tape. This unit is quite similar to Liquid rubber peel and stick seam tape.
If you have a metal roof, you must keep a sealant or seal tape in your home.
A sealing tape is indeed an innovation in the sealant world, as sometimes we need to cover a small area from leaking.
However, this product is an instant solution compared to sealant—no drying time and no hassle. But, like sealant, you cannot cover your entire roof with seal tape. But, if you talk about damages, this product is excellent.
Liquid rubber peel and stick seam tape; gorilla waterproof patch and seal tape is a 10-foot roll of seal tape that creates a permanent bond on various materials.
This unit also works well with plastic and acrylic, and you can use this product in any season.
- This product is available in white and black color.
- Seal tape repairs holes, gaps, cracks, and tears.
- It also fixes leaks in roofs, rubber, plastic, and other materials.
- This product offers resistance to UV rays.
Another impressive feature is that you can also apply this product underwater.
- It protects the roof from sun rays
- It fills the minor cracks and holes
- The durability is commendable
- Applying a coat of primer is necessary
6. Liquid Rubber Waterproof Sealant
No matter whether your roof is leaking or you want to protect it from the climate—liquid rubber waterproof sealant is designed to protect your metal roof from damage.
This unit creates a solid and capable protective membrane on the top, regardless of a flat or sloped roof.
However, the sealant creates a robust coating that resists standing water and protects your roof from rain, snow, hail, and other disasters.
Not to mention, this sealant is UV resistant; it will protect your roof from aggressive sun exposure and other climatic conditions.
It is a water-based sealant; relatively easy to apply. But, we did not like that it is available only in black color.
- This unit goes well with other materials as well.
- One gallon can cover up to 30 square feet.
- The final membrane has a firm grip and prevents adhesion failure.
- No need to apply any other solution for extra coverage.
The area each gallon covers is more than many other sealants.
- The drying time is quick
- No need to use any primer or top coat
- This sealant is water resistant
- The durability is not that effective
7. Novagard 02-MR196-10C1
The next on our list is a different product; but, it is a pretty good sealant for metal roofs. Novagard 10C1 is a non-corrosive, single component, silicon-based sealant.
You must be thinking that a silicone-based sealant is not the right product for a metal roof.
But, this product made it to us due to the unique features. An oxime cured and an adhesive sealant go well with a metal roof.
Hence, Novagard does offer a solid joint for the metal roof system. This product is somewhat similar to sealant tapes, as you cannot cover the entire roof with this product.
Not to mention, Novagard develops a primer-less adhesion to construction substrates.
In addition to this, once you apply the solution, it will contract and expand alongside substrate movement.
- This unit offers less drying time.
- You can also use this sealant on wood, plastic, and acrylic.
- No need to use any primer.
- Instantly provides support to minor cracks and holes.
The best part is that this sealant will be a good fit for all materials. Doesn’t it sound amazing that you will not have to store big containers of sealants for every surface separately?
- The application process is easy
- It is completely water-resistant
- The solution is neutral
- It is not completely odorless
8. Loctite Black Roof and Flashing Sealant
Moisture barriers and other minor issues are pretty familiar with a metal roof. But, the key is to maintain the metal roof.
The flashing technique is vital for moisture barriers; but, it can leave your roof exposed to moisture in extreme weather conditions.
Hence, you must use a sealant to protect your roof. Loctite black roof and flashing sealant are similar to Novagard, a rube sealant. This unit is specially designed to access gaps created by metal flashing.
Loctite also functions as an adhesive and provides a gap between flashing and your roof.
- This sealant resists deterioration from the weather.
- It is a UV-resistant sealant.
- No need to add any primer.
- This unit is elastic and remains flexible throughout the material movement.
This sealant comes with weather-resistant properties, which restores the overall condition of your roof.
- It works well in all seasons
- It protects the roof from UV exposure
- It fills all the cracks
- The drying time is not quick
9. Tuff-Gard Waterproof Coating
Next on our list is; Tuff-Gard Waterproof coating sealant. It is a single component rubberized, solvent-free solution for your metal roof.
Not to mention, this unit is 100% waterproof and will not disappoint you.
We are amazed by the smooth application and the amount of product used to fill a crack.
However, if you use this sealant to cover your entire roof, we recommend using a roller or squeegee.
Not to mention, you can use this unit on moist areas as well. You can also use this sealant on foam, stone, wood, cement, or EPDM.
The elongation is more than 1800%, along with water vapor transmission features.
- This sealant is eco-friendly and safe around pets and kids
- No need to apply any other solution or primer.
- It is a water and weather-proof sealant.
- The spread rate is 40 square feet per gallon.
Tuff-Gard is not just the name of this product. It is a tough guard and will keep the surfaces sealed as you want them.
- It creates a good barrier
- No need to use any primer
- It is easy to use and apply
- It is not completely odorless
10. Henry HE587372
The last on our list is Henry HE587372. With this product, you can regain the aesthetics of your roof by applying a single layer.
This unit is a reflective sealant, offers strong durability around the year, and protects your roof from snow, hail, rain, and other disasters.
Not to mention, Henry does not trap heat or moisture, which in turn resists dampness, mold, and other problems.
Also, compared to all other sealants on our list, this unit has a spread rate of 100 square feet per gallon for a flat roof.
- This unit resists bacteria and mold.
- The sealant is paintable.
- The protective membrane is strong enough to protect a metal roof from the rain.
When we tried this sealant, the finish was fresh, and the membrane was strong enough to allow movement over the surface and still look neat.
- It protects the roof from all kinds of disasters
- It does not require to apply any primer
- The drying time is also quick
- The solution is very thick
Best Sealant for Metal Roof—Buying Guide
So far, we have covered the top ten best sealants for metal roofs. We hope that you have gained information about sealants.
But, there are other factors that you need to consider before buying a sealant for a metal roof.
There are various types of sealants: silicone, rubber-based, water-based, etc. The water-based sealants are easy to apply, and they dry real fast.
However, you need to apply multiple coats to achieve the thickness of the water-based sealant.
On the other hand, the solvent-based sealant is thick and takes time to dry; but only one coat is sufficient.
The longevity of a sealant also depends upon the type of the product. The sealant tapes do not require any unique application process to increase the period.
However, a liquid sealant requires a thick coat. A 30-millimeter thick coat will work for ten years.
A sealant’s reflectivity translates into less heat absorption and provides an overall cooler home.
The color of the sealant also plays a significant role in the level of reflectivity. White and light-colored sealants possess the highest reflectivity.
How we tested the best sealant for metal roofs?
I wanted to repair my metal roof for quite some time now, but; i was quite skeptical about it. However, one of my friend suggested that I should use a sealant for metal roofs. He has already done the experiment on his own roof and the results were quite impressive.
So, I decided to give it a shot and started researching different types of sealants available in the market. I got a lot of insights from his experience and decided to test the sealants on small portions of my roof before investing in a complete repair.
Water-Based vs. Solvent-Based
When it comes to choosing the right sealant for metal roofing, one of the most important decisions lies in the type of sealant. I tested two types: water-based and solvent-based sealants.
Water-based sealants are made from acrylic resins, which create a water-resistant seal that is flexible and can handle a wide range of temperatures. This type of sealant is easy to clean up, does not emit any hazardous vapors, and is considered an environmentally friendly option.
Solvent-based sealants are made from chemicals such as xylene or toluene and create a strong bond between the metal and the sealant. This type of sealant can handle extreme temperatures, has a strong odor, and may emit hazardous vapors, which makes it necessary to wear protective gear when applying.
To determine which type of sealant was best for metal roofing applications, we tested both water-based and solvent-based sealants for their flexibility, strength, water resistance, and ability to handle extreme temperatures.
I found that the solvent-based sealant was a better choice as it offered superior performance in all areas, but I also noted that it did emit hazardous vapors and should be used with caution.
I conducted a water resistance test to determine the effectiveness of our sealant on metal roofs. Basically, my core purpose of applying the sealant on the roof was because of leakage issues.
I applied sealant to metal roofing panels and then exposed them to a continuous stream of water for 24 hours. After 24 hours, checked the panels for any signs of leakage or damage from water exposure.
I found that the sealant was able to protect the metal roofing against water damage, indicating that it is a good choice for metal roofs when it comes to waterproofing.
We also tested the sealant for its UV protection capabilities. To do this, I painted samples of the sealant on metal panels and exposed them to direct sunlight for seven days.
Afterward, we inspected the coating for any signs of damage or discoloration. i found that the sealant was capable of protecting the metal from UV rays, as there was no noticeable difference in the panels’ coloring or surface after being exposed to sunlight.
This means that the sealant can be used to protect metal roofs from UV damage over time, thus prolonging its life span. Overall, i was satisfied with the performance of the sealant when it came to UV protection.
Ease of Application:
I wanted to make sure that the sealant was easy to apply by following the manufacturer’s instructions. I applied a small amount of the sealant onto one piece of metal roofing and used either a brush or roller, depending on which the product recommended. Then I left the sealant to dry for 24 hours before assessing its adhesion.
The durability of the sealant was also important for me to test, after all, I am investing my money. I used a pressure-washer to simulate harsh weather conditions and sprayed the sealed metal roofing with water from different angles. After an hour, I visually assessed any damage or wear to the sealant’s adhesion. Then we left the sealant to dry and checked it again 24 hours later, and it was all good.
What type of sealant should I use for a metal roof?
The best choice for a metal roof is an elastomeric coating, which is specifically designed to expand and contract with the temperature changes on the roof. Elastomeric coatings are highly durable and will protect your metal roof from the elements.
How often should I re-seal my metal roof?
Depending on the severity of your climate, it is recommended that you reseal your metal roof every 3 to 5 years. This will ensure that your roof remains in top condition and protected from the elements.
How do I apply sealant to my metal roof?
Applying sealant to your metal roof is relatively easy and can be done with a brush or roller. Before applying, be sure to properly clean and dry the surface of the roof. Then, apply a thin layer of sealant in even strokes across the entire surface of the roof.
Allow the sealant to dry according to manufacturer’s directions before re-applying a second coat for added protection.
Are there special considerations for sealing around vents and other accessories on my metal roof?
Yes, it is important to properly seal around any vents or other accessories on your metal roof. Use a high-quality silicone caulk or sealant to prevent any moisture from getting into the crevices and causing damage. Additionally, be sure to use a primer before sealing around vents for added protection against water infiltration and corrosion.
How do I maintain my sealed metal roof?
To maintain a sealed metal roof, it is important to regularly inspect and clean the surface. Remove any debris or dust that has accumulated on the surface by using a broom or soft bristle brush.
Additionally, be sure to check for any signs of wear, such as cracks or breaks in the sealant. If you notice any damage, reseal the area immediately to ensure a long-lasting metal roof.
By following these FAQs, you can ensure that your metal roof is properly sealed and maintained for years to come!
I grew up on a small farm in New Jersey. We had a big family because my parents, my uncles and aunties all were living together on this farm so, you can imagine, it was always over crowded with people. But living in farm was really great because we had to do everything on our own and I learned so many things from my parents and uncles and aunties and that is where I found my passion for fixing things, whether it is renovating or designing, I was always there. Read more