Best Sealant For Metal Roof Leak in 2022 [Top 6 Reviews]

The roofs of our home can withstand an extraordinary attack of severe weather. But due to daily exposure to the rain, wind, snow, or sun, eventually the toughest roofs will also degrade. Well, to be honest, I have personally experienced roof leaks many times, especially during the monsoon season.

It takes a lot of cash to repair, and some of my furniture was damaged as well. One of my neighbors told me to apply sealant on my roof, which prevented such issues from taking place, even during extreme weather conditions. So, I started looking online for the best sealant for metal roof leak, and trust me, I found many of them.

So, for all those people who are suffering from metal roof leaks around their homes, I am here to save your day.


Go through this article and check out the reviews I have provided about the best roof sealants.



Editor's Rating


Dicor 501LSW-1 Epdm Self-Leveling Lap Sealant

5 Out of 5

Flex Seal Liquid Rubber

Flex Seal Liquid Rubber In A Can

5 Out of 5

Heng’s Rubber Roof Coating

4.5 Out of 5

Rust-Oleum 265495 LeakSeal Rubber Coating

4.5 Out of 5

Sashco 14004 Gallon Clear Roof Sealant

5 Out of 5

Liquid Rubber RV Roof Coating

4 Out of 5

Our 6 Best Sealant For Metal Roof Leak Reviews

1. Dicor 501LSW-1 Epdm Self-Leveling Lap Sealant

Dicor is a company that has never failed to impress me with its products. I have used their sealant for my roof, and it exceeded my expectations. The EPDM Lap Sealant is third out of the three-part roof system of Dicor.

When you apply this sealant to your roof, it will create a secondary and secure seal along the edges of the roof. Wait it's not just the roof edges, but on the edges of the screw heads and vent pipes as well.

You are probably thinking, why did I suggest this product to you, because I have tried it myself, and so did many of the people in my neighborhood. What’s unique about this sealant? It's compatible with TPO and EPDM sheeting.

Also, this sealant will adhere firmly to the concrete, aluminum, fiberglass, vinyl, mortar, galvanized metal, and wood.

One more thing, you must use this self-leveling sealant on horizontal surfaces only. I will not use or even recommend you to use it on a vertical roof.

The reason why I am telling you this is because the EPDM Lap Sealant is only for a horizontal roof as it flows and settles out. Applying on a vertical roof will provide you with a non-leveling of the sealant.

Features of the product:

  • Well-suited for aftermarket use.
  • Comes in white color.
  • Will secure the edges of the air vents.
  • Ideal for camper roofs, RV or Caulk.

2. Flex Seal Liquid Rubber In A Can

Flex Seal Liquid Rubber In A Can

Flex Seal Liquid has been providing homeowners with the best sealant for their roofs for many years. To be honest, I would personally recommend this product. No, I never used it on my roof, but I do know people who did.

They were satisfied with the results. This is the best sealant for metal roofs I have ever come across because it comes in a rubberized and thick liquid.

You can dip, brush, or pour it over on the affected area of the roof. Doing so, the thick liquid will form a flexible, durable, and watertight barrier over the roof.

The best thing about this sealant is that it will seal out all the moisture, air, and water away from your roof. You will definitely not experience any roof leaks when the weather conditions are pretty rough.

I almost forgot to mention that this liquid rubberized sealant is UV, mildew, and chemical resistant. You will have no issues using this sealant, and they are ideal for not just roofs, but gutters, ponds, basements, pools, birdbaths, and sports equipment.

Once you apply the liquid, it will take around 24 hours to 48 hours to dry. Be sure to dust out all the dirt before applying the sealant to the roof.

Features of the product:

  • Ideal for RV, Campers, Boats. Trailers, etc.
  • Will flow within the cracks.
  • Will prevent corrosion and rust.
  • Non-flammable and non-hazardous.
  • Available in white, black, and grey color.

3. Heng’s Rubber Roof Coating

When it comes to durability and quality, Heng’s roof coating products stand out among the rest. This was the first sealant that I came across through a friend, so I decided to do some research on it.

You will be surprised to know that this rubber roof sealant will work on the previously coated sealant. I will also suggest you conduct the sealant work after eliminating all the dust and dirt from the affected area. Otherwise, it might cause other damages to take place.

Also, the product will only perform and do well if you have an EPDM rubber roof. It’s because the seal stands out as the perfect solution for those types of roofs. The product weighs around 5 pounds, and you can use a brush or a roller to apply it to the roof.

This rubber sealant will also cover 30 feet and comes in two gallons. Your roof will get sealed off permanently, and it will not receive any damage when the weather is pretty bad.

It’s guaranteed that Rubber Roof Coating will protect your roof from angles. The coating will also prevent any other mishaps from taking place. Once you apply the product, you will receive a smooth finish instead of a slippery one.

Features of the product:

  • Comes in white color.
  • Ideal for RV rooftop, vents, and air conditioners, etc.
  • Expands the contrast of the roof.
  • UV resistant.
  • Non-toxic and Non-polluting.
  • Resistant to impact and cracking.

4. Rust-Oleum 265495 LeakSeal Rubber Coating

Rust-Oleum is highly reputed and well-known for solving all types of challenges. Their product LeakSeal Rubber Coating is pretty unique.

It’s because their sealant carries an advanced rubberized formula that will act as a permanent barrier for your rooftop. The reason why I am recommending you this product is because it’s not like the other rubber sealants. When compared with other sealants, they are pretty different.

What’s more? The product will protect your rooftop from corrosion, rust, and moisture. You don’t need to brush it, pour it or roll the sealant.

All you need to do is spray the roof sealant on the affected areas. This is what I really liked about this product. 

Spraying all the cracks and leaks will help you save plenty of time. Once the spraying work gets completed, it will create a water-tight barrier. This will help in providing your rooftop the protection it needs.

You must be wondering, why am I so hyped about this product? Well, it’s because, when you have no time and want fast and quick repairs, this product will be a lifesaver for you. You can easily carry it from one place to another, and you need some manual or instruction on how to use it.

Features of this product:

  • Will seal all the problematic and hard-to-reach areas.
  • They are excellent for PVC, gutters, concrete, flashing, masonry, ductwork, etc.
  •  Delivers a paintable finish.
  • Easy to use.
  • It will not drip or sag.
  • Will dry up within 30 minutes and covers 8 square feet per spray.

5. Sashco 14004 Gallon Clear Roof Sealant

Sashco’s products are something that will never disappoint you. You know why? It’s because its Clear Roof Sealant has the power to make the leaks and cracks disappear.

Once you apply the sealant, the cracks or leaks will disappear like magic. As if they were never there. All this magic comes from the unique copolymer rubber formula of this sealant.

It will quickly and effectively seal up all those affected areas with no issues.

The sealant is pretty easy to use as it comes in the form of a gun-like structure, and its invisible and permanent formula will permanently fix your roof.

The most unique thing about Sashco’s sealant is that you can conduct roof fixing work even during a rainstorm. It will also do its magic on dry surfaces, and it will not freeze. If you want to fix that gutter located near your house? You can do that as well with this sealant.

Your neighbors might give out some concerned stares, but trust me, they will be thanking you later on when you host a party in the neighborhood, and their heads will stay dry.

Features of this product:

  • Works perfectly for all weather conditions.
  • Easy to use and to apply.
  • Will remain watertight and elastic year after year
  •  Ideal for roofs, chimneys, bricks, vents, blocks, shakes, and shingles, etc.

6. Liquid Rubber RV Roof Coating

L R Store provides some of the best products and items when it comes to a roof coating. What I like the most about their products is that they are nature-friendly.

It will save you plenty of money. L R Store has many high-quality products. They will fully adhere to, flexible and seamless membrane that will protect your rooftop from UV-rays, moisture, and water.

You can coat the affected areas with this RV Roof Coating 1 to 2 times per day. When applying this particular roof sealant, I would recommend you to apply at a temperature of about 10C or 50F.

Another thing about this sealant is that it's pretty flexible. There is no need for you to worry about minor movements destroying all your hard work.

You can coat the roof of your home, RV, camper homes, trailers, foundations, metal roofs, shades, planter boxes, and gutters. Applying this roof sealant is super easy, as you need a brush or a paint roller to get the job done.

It’s completely non-toxic and non-flammable, so you will experience any side effects or an allergic reaction if it comes in contact with your skin.

Features of this product:

  • Contacts no VOC (Volatile Organic Compounds) or solvents.
  • The product is water-based.
  • You can use it both outdoors and indoors.
  • Resistant to harmful chemicals, thermal cycling, salt, etc.
  • Can cover up to 50 square feet.

Comparison Chart of Sealant For Metal Roof Leak

Product’s Name

Color of the Product

Main featureSurfaces they are used

Surfaces they are used

Dicor 501LSW EPDM Lap Sealant


Ideal for TPO and EPDM sheeting

Aluminum, concrete, mortar, wood, etc

Flex Seal Liquid Rubber


Prevents corrosion and rust.

Ponds, gutters, trucks, vans, etc

Heng’s Rubber Roof Coating

Bright White

Resistant to Ultraviolet rays

RV rubber rooftops, vents, AC, etc

Rust-Oleum 265495 Coating Spray


Prevents water and moisture

Masonry, concrete, PVC, flashings, etc

Sashco 14004 Clear Roof Sealant


Carries high durability

ABS vent pipes, roofs, roof jacks, etc.

Liquid Rubber RV Roof Coating

Brilliant White

Solar reflective and 1000% elongation

Sheds, foundations, RV roofs, etc

How to Purchase the Sealant For Metal Roof Leak?

You are well aware that the roof stands out as one of the difficult constructions within a building or a house. It’s because each surface demands a different knowledge. There are many environmentally-friendly and non-flammable products that are available in the market.

But your job is to choose which one is the right one for your property. Given below are some of the ways through which you can make the right decision.


Researching is something that is highly essential when looking for roof sealants. To need to opt for the one that matches perfectly with the roof of your home, RV, trailer, or foundation.

As per my knowledge, you will come across sealants, such as polysulfide sealants, polyether sealants, polyurethane coatings, and silicone sealants. Make sure to learn more about these sealants and coatings, and check whether they are any other type of sealants available.

Gaining more information will help you know about their features, benefits, and whether they are the best ones for you.


Elasticity is an ability of an element to elongate before it breaks. The ability to stretch and recover from it indicates that the sealant can make movements when the temperature rises and drops without cracking.

So, you must opt for those products that can recover right after stretching as your ultimate sealant for your roof. When the elasticity is much higher, the chances of the sealant to endure the roof fluctuation will be much higher as well.

Strength of the Tensile

Tensile strength is the amount of force, which a particular product can endure right before it shatters. As per my knowledge, you will come across a type of tensile strength, which is the tensile strength after it has been applied or aged, and the tensile strength after the item came out from the packaging.

When you go through the manual of the sealant, you will find that the majority of the items report about the tensile strength of the former. It’s a good thing to know about the tensile strength when it's brand-new.

But the sealant, on the other hand, must have tensile strength when it's revealed to the outside. This will help in providing an extra level of strength.

Moisture gained through Weight

There are many sealants out there that will absorb the water instead of repelling them. Take my suggestion, go for the one that repels the water. Choosing a roof sealant that absorbs the water will hasten the roof’s degeneration.

You must look for the best sealant for metal roof leak that will absorb less amount of water gain by weight. To make sure it repels the water, try testing the sealant on a different surface before applying it to the roof.

The Perm Factor

When there is a low amount of perm factor, it will indicate that the sealant carries a great resistance to enabling the humidity to seep through the material.

This is the type of sealant you need for your roof, and it’s guaranteed it will serve you well in the years to come.


Price is something that you must consider before you decide on buying the sealant. All sealants are not the same, and so are their prices. Each of them is made from different products and comes with its own benefits.

That is why the price is different. Whether you are buying the sealant from a physical or online store, comparing the prices is compulsory.

You don’t want to spend too much money on a sealant that costs more but is of poor quality. 

So, take a look at the prices first before investing in a roof sealant.

FAQs - Frequently Asked Questions & Answers

1. Why do I need roof sealants?

The roof sealants are designed to deliver an additional level of protection to the roof. The roof sealants will also protect it from continuous contraction and expansion, which is known as thermal shock.

This thermal shock takes place because of the fluctuating warmth, and it will also insulate the roof making it energy-efficient.

2. Can the sealant be on any roof?

In short, yes, it can. Whether you have a metal, aluminum, fiberglass, wood, or galvanized metal roof, the sealant will work perfectly on them. Apart from that, it is also ideal for EPDM (Ethylene Propylene Diene Terpolymer), Commercial low-slope roofs, TPO (Thermoplastic Polyolefin), and BUR (Built-up roofs).

3. What are the steps to prepare my roof for coating?

When it comes to applying the sealant on the roof, the process is pretty simple. The first thing you need to do is eliminate the dirt, dust, grease, or oil present on the roof.

For ballasted or gravel commercial roofing, make sure the surface gets treated before applying the sealant. 

After that, you can use a brush, roller, or any other item to apply the sealant on the roof. You can do all the preparations on your own.

Otherwise, you can call in a professional for the job like I did. You can apply one or two coats per day to obtain the desired results.

4. How long will the roof sealant last? Do they come with a warranty?

This is a good question. Roof sealants will last at least 10 long years. There are many other sealants out there that will last more than that. But the longevity of the sealant will depend heavily on the weather, location, and conditions of your property.

It also depends on the thickness of the roof sealant. When it comes to warranty, some reputed companies provide over 50 years of warranty on their roof sealant. It's recommended that you check the warranty of the sealant before buying.

5. Is it possible to apply roof sealant on an old roof?

Of course, it is. When you apply the roof sealant on your old roof, it will increase its lifespan with no issues. It will protect against the Ultraviolet rays of the sun. The sealant will keep out snow and rain from affecting the roof.

Furthermore, it will also prevent your roof from cracking and leaking. So, when the summers are pretty hot, or it's pouring heavily during the monsoon season, you do not have to worry about your roof getting damaged anymore.

6. Where will I find the right sealant?

There are many well-known and reputed stores out there that provide high-quality and top-notch roof sealants from various companies. You can also take a look at the online shopping platform Amazon where you have plenty of products there.

Final Words

Roof sealants are quite important nowadays. They stand out as the perfect option when it comes to protecting your home or building from leaks, cracks, and rough climatic conditions.

Whether you have a stationary home, camper, RV, trailer, or mobile home adding an extra layer of protection will save you plenty of money.

This article will be your ultimate guide towards the right and the best sealant for metal roof leak, and it contains some of the best and high-quality ones. Check out the comparison table and know which product to choose.

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