Best Caulk for Metal Roof (2022): Top 10 Metal Roof Caulk

So, you’re planning to fix the holes and leaks in your old metal roof, right? But how? Even though there are plenty of different ways available, most of these are not that easy!

Plus, these all are time-consuming.

best caulk for metal roof

Having anxiety attacks already? Well, it’s time to take a deep breath and relax. We’re presenting the best caulk for metal roof which you can choose to say goodbye to those leaks and holes permanently.

A caulk itself is more than enough to repair every little gap in your roof. So, ensure to read this review to know which sealant stands head and shoulders from the rest.



Editor's Rating


GE Sealants & Adhesives GE5050

GE Sealants & Adhesives GE5050

5 out of 5

Dicor 501LSW-1

Dicor 501LSW-1

4.5 out of 5

Sashco 13010

Sashco 13010

4.5 out of 5

5 Best Caulk for Metal Roof Reviews 

After doing few hours of research, our team has successfully handpicked 5 different metal roof sealants to let you repair the holes in your metal roof in the best way possible.

1. GE Sealant for Metal Roof

GE Sealant for Metal Roof

Let us show you a super-duper model from the number 1 silicone brand named GE Sealants and Adhesives. If you’re looking for the best sealant for metal roof, you should have a look at this item.

Whether it’s your rooftop, gutter, windows, or door, with the advanced unique formula, it’s highly capable of sealing and repairing within no time.

And guess what? It’s great for all types of metals, allowing you to seal the joints and fill the gap without much effort, including nickel, bronze, chrome, and so on. 

Coming with the “metallic grey” color, the sealant delivers optimum adhesion in order to ensure a tighter and stronger bond. Speaking of protection, it’s 100% waterproof and able to protect the surface from heavy rainfall and water damage.

Plus, it keeps the surface away from mildew growth and stain-causing mold. So after applying it, you can keep your metal surface away from all issues. 

Not only it withstands heavy rainfall, but it also resists cold temperatures and extreme sunlight to make sure a permanently flexible seal. 

Since it’s a fast-drying caulk, it won’t take more than 30 minutes to dry. But unfortunately, it requires a full day when it comes to curing. It’s because the sealant creates an extremely strong adhesion to extend your metal roof’s lifespan.

With a size of around 10.1 ounces, this little boy suits both indoor and outdoor surfaces best. It’s non-paintable, offers minimal odor, and most importantly, delivers lifetime protection.


  • Compatible with several types of metals
  • Able to do both sealing and repairing
  • Waterproof and dries fast
  • Ensures protection against hot and cold temperatures
  • Keeps surfaces away from mold and mildew growth
  • Designed to use on both indoor and outdoor surfaces


  • Takes a whole day to cure!

2. Dicor 501LSW-1 for Metal Roof Repairing

Dicor 501LSW-1 for Metal Roof Repairing

Specially designed for horizontal applications, we prefer this one for those who need an RV roof repair sealant at an affordable range. Even, you can use it to repair fiberglass as well. 

With the advanced sealing capability it gets, you’ll be able to fix vent covers, screw heads, vent pipes, and roof edges within minutes. Thanks to the UV-stabilized feature that ensures flexibility, no discoloration, and no deterioration at the same time. 

When it comes to compatibility, the sealant provides great adhesion to galvanized metal, aluminum, wood, mortal, vinyl, concrete, etc. It keeps the surface out of stain and mildew growth for a long period of time.

The caulk equips about 10.3 ounces in a single tube. But you’re getting a total of 12 pieces of caulks to repair each and every type of metal roof. It shows off a ”white” color once it gets fully dry.

Since it’s compatible with all weather conditions, you won’t have to face much of a problem in terms of applying it. So it doesn’t matter whether it’s summer, rain, or winter.

Without taking a lot of time, it creates a super-strong bond, allowing you to seal the joints and hide the holes of metal roofs within a snap. But here is one thing to keep in mind, you’ll have to provide a bit more adhesive to create a solid and gap-free surface.


  • UV stabilized feature for optimum functionality
  • Offers a total of 12 pieces for more repairing
  • Suits all weather conditions
  • Perfect for multiple applications and surfaces
  • Takes a little time to dry


  • You’ll have to use a higher amount of adhesive to create a strong bond!

3. Sashco Lexel Flexible Caulk for All Metal

Sashco Lexel Flexible Caulk for All Metal

Sashco 13010 is known as the “Duct Tape” of caulk. Hand down, it’s one of the strongest metal roof sealants that we’ve tested so far!

It’s nineteen times clearer compared to silicone. Thanks to the ultra-clear formula it comes with, making it great for a wide variety of projects.

The super-elastic caulk comes in a self-leveling feature that moves straight away when the surface moves. It ensures a permanent seal to let you get a leak-free surface.

Surprisingly, it keeps mold and mildew growth far away from the bathroom. And needless to say, this one right here also comes with a waterproof design. Meaning, it withstands rainfall and a certain amount of water pressure. 

So, without a doubt, the sealant can be used to repair your shower and sink. And guess what? It won’t turn yellow or cloudy, even after facing abrasive cleaners, harsh UV exposure, extreme cold, and so forth. Impressive, eh?

Well, the 10.5 oz sealant is compatible with both exterior and interior surfaces, and most importantly, it’s capable of handling more than 390% joint movements. Thankfully, you can use extra paints over the sealant.

Do you think it’s just a typical caulk for metal? Wrong, this versatile piece of sealant works great on a wide variety of surfaces, including aluminum, brass, steel, anodized windows, metal doors, asphalt, concrete, vinyl, tile, polycarbonate, wood, and A LOT MORE!


  • 19 times clearer than the typical silicone
  • Mold and mildew-resistant
  • Friendly with tons of different surfaces
  • Waterproof and weatherproof
  • Handles around 400% joint movements


  • A little bit costly!

4. Loctite PL S30 Black Roof and Flashing Sealant

Loctite PL S30 Black Roof and Flashing Sealant

The polyurethane Sealant from Loctite comes in premium quality. Capable of handling no more than 25% joint movements, it’s a great roof repair sealant that suits every single exterior joints and gap.

Talking about size, you’re getting a single piece of tube that weighs around 12.8 ounces. It ensures tear-resistance and optimum longevity for extending your roof’s surface.

The elastic sealant is pretty much flexible and requires minimal time to dry. And more interestingly, it needs no extra primer to create a super-strong bond.

You’ll be happy to hear that, the particular sealant is 100% waterproof. That means it can tolerate heavy rainfall and extreme water pressure, enabling you to use it at the top of the roof, under the sink, etc.

Alongside the waterproof design, it also comes in UV protection. As a result, it won’t lose its quality and color too early. Since it’s an ozone-resistant caulk, we like to call it an environment-friendly item.

It comes with a low-VOC formula, so at least you won’t have to deal with unpleasant odor while applying this sealant. It’s paintable, durable, and lasts for long. 


  • Suits every single weather condition
  • Low odor and high flexibility
  • Doesn’t take hours to dry
  • Environment-friendly
  • Requires no extra primer


  • The tube is a bit tough to squeeze!

5. Titebond 61111 Caulk for Metal Roof Flashing

Titebond 61111 Caulk for Metal Roof Flashing

Caulking for metal roof will be a breeze from now on if you get your hands on the Titebond 61111. It comes with a 10.1 oz tiny tube that is way too easy to apply compared to the other similar models.

Titebond; the caulk creates a tight binding with the surface to make sure ultimate durability, the name speaks for itself! It fits perfectly with a variety of different materials, including Kynar coated metal, steel, aluminum, brass, wood, glass, plastic, and many more.

Particularly designed for metal roofs, it also suits galvanized gutters, architectural metal siding, and flashing. Like our earlier model, it’s compatible with water-based paints as well.

Without a doubt, the particular sealant is weather-friendly and UV resistant, which means users can smoothly use it for exterior applications. Even they can fix the leakage issues within minutes through this little bomb!

What’s more? The caulk includes zero solvent, and most importantly, it delivers pretty low odor, for which users can repair or seal the metal roofs without dealing with a chemical smell. Overall, it might be a good option for every homeowner. 


  • User-friendly
  • Suits plenty of different materials
  • UV resistant and friendly with harsh weather
  • Free from the chemical smell


  • Bubbles might appear if not well-cured!

How to Choose Caulk for Metal Roof? 

best metal roof caulk

You need an efficient sealant for metal roof, right? That’s good! But how to pick the right one since the market includes a lot of junks these days?

Well, keep all your stresses and worries at bay, as our team will show you some of the core factors. After considering these factors, you’ll be able to know how to pick up the right caulk for roofs.

Ease of Use

The caulk you’re going to buy should be user-friendly, and this is the first thing that you should keep in mind before buying a caulk for metal.

We all aren’t experts in terms of roof repairing. So, the item you want to buy should be easier to apply, for which you can fix the issues of your metal roof without anyone’s assistance.


The sealant should be friendly with all weather, especially harsh conditions. Of course, it should be capable of bearing heavy rainfall, cold temperature, and excessive sunlight. If not, the caulk will lose its quality within just a few days. 


It’s always a plus if you choose a caulk that equips a waterproof design. According to our research, the silicone and rubber types are the best options if you’re looking for optimum protection against water. These all are highly capable of tolerating extreme water pressure for ensuring longevity.


Before you get yourself a specific adhesive, you have to make sure you’re choosing one that’s compatible with multiple types of metal materials, including steel, aluminum, copper, brass, etc. 

In a nutshell, your caulk should be versatile, so you can repair all kinds of metal materials without spending extras. Besides, we prefer having a sealant that fits both interior and exterior surfaces

Durable and Flexible

Both durability and flexibility should be equipped with your caulk. A less durable sealant won’t stand for a longer period. Besides, if the caulk you’ve picked is not that flexible, it’ll ultimately crack within days.

If durability is your concern, ensure that your sealant creates a tight binding with the surface. For better protection, it should be able to keep surfaces out of mildew growth.

Fast-Drying Caulk

When it comes to caulking for metal roof, it’s better to pick up the one that dries pretty quickly. Most efficient sealants out there require just a few hours or so to dry and cure. You should get such items if you want a quicker result. 

Frequently Asked Questions

How should I use or apply sealants?

There are so many ways to apply or use roof sealants. Depending on the adhesive, you can use a paintbrush, paint roller, or a paint sprayer. But these days, most people feel much comfortable using caulk guns. It’s all up to you! 

What’s the right way of removing old roof caulks?

Using a plastic putty knife will be a good idea to remove the old caulk. But you have to make sure you’re not damaging the surface. 

Can I stop leaks permanently through a caulk?

Of course, even a sealant is the best thing that you can use to stop leaks and repair roofs. With its unique efficient formula, the sealant needs only a few minutes, or sometimes a few hours in order to cast the leakage issues away. 

Which type of caulk should I pick for flat roofs?

Though there are multiple options available, we suggest picking up the sealant that is made of silicone. Rubber can be another better alternative if you’re hungry for the best result.

Should I need to wear hand gloves while applying caulk for metal?

Of course, it’s safe and lets you repair roofs without dealing with skin irritations.

Final Word

Purchasing the best caulk for metal roof is the solution to get rid of every roof related issue. So, make sure to choose your desired sealant as soon as possible for fixing the holes in your metal roof once and for all.


About Tools Archive Team

Avatar for Tools Archive TeamWe're a group of people who know a lot about home improvement and automobiles. All of our members are experts in their fields. We wrote this blog to answer your questions about home improvement and automobiles.