Best Sealant For Metal Roof Leak (Top 10 Only)

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 for helping 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.

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.

Model

Weather-Proof

Usage

Price

Liquid Rubber Color Waterproof Sealant

Yes

Usable on sloped roofs and planter boxes

Rubber seal Protective Coating

Yes

Works on metal roofs

Liquid Rubber RV Roof Coating

Yes

Can be used on multiple materials

Liquid Rubber Peel and Stick Seam Tape

No

Perfect for tears, copings, flashings, and gutters

Gorilla Waterproof Patch & Seal Tape

Yes

Seal tape repairs holes, gaps, cracks, and tears

Liquid Rubber Waterproof Sealant

Yes

It has firm grip and prevents adhesion failure

Novagard 02-MR196-10C1

No

It provides support to minor cracks and holes

Loctite Black Roof and Flashing Sealant

Yes

It is elastic and remains flexible throughout the material movement

Tuff-Gard Waterproof Coating

Yes

It can fill cracks

Henry HE587372

Yes

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. 

Highlighting features:

  • 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.

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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. 

Highlighting features:

  • 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.

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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. 

Highlighting features:

  • 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.

However, the only drawback of this sealant is the drying time.

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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.

Highlighting features:

  • 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!

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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. 

Highlighting features:

  • 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.

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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 damages.

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.

Highlighting features:

  • 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. 

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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.

Highlighting features:

  • 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?

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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. 

Highlighting features:

  • 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.

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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.

Highlighting 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. 

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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.

Highlighting features:

  • 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. 

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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.

Easy application:

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.

Time-period:

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.

Reflectivity:

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.

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