The Best Gutter Sealant That’ll Fix All of Your Problems

Are your gutters or roofs suffering unwanted leaks and cracks? Well then, the best gutter sealant is definitely the answer to all your problems. Unlike power tools, there are much more options for gutter sealants and a lot of brands to choose from. But how do you know which brand to use for your gutters? In this buying guide, I’ll help you select a great gutter sealant to fix all of your problems.


Factors to Consider

1. Drying Time

Of course, you wouldn’t want a gutter sealant that takes forever to dry. Although drying times vary from brand to brand, all of the products on our list are proven to quickly and efficiently enough to provide a quick fix to cracks or leaks.

The drying time of your gutter sealant isn’t the only thing you have to consider. You also have to take into account the finish of the sealant upon drying. Ideally, you will have a semi-smooth to a smooth finish, not a flaky or crusty one. Thus, I suggest steering clear from cheap or knock-off brands that won’t give you the same quality finish.

2. Functionality

Even if this buying guide is especially made for gutter sealants, you also have to consider the other possible functions since you probably won’t be using up the whole can.

Before selecting the best gutter sealant, look at its other functions. For instance, a gutter sealant can also work as a filler for gaps and holes, or a sealant for other things aside from gutters; such as roofs, PVC pipes, masonry, concrete, etc.

3. Sealing Properties

It is a given fact that a gutter sealant has to have great sealing properties. How do you know if a gutter sealer has what it takes to seal all leaks, holes, and gaps? Well, this is what this article is for, right? Aside from reading all our reviews, you can test out a particular brand for its sealing capacity.

On the other hand, how do you know if the gutter sealant is effective? The most obvious method is to see if the leaks are fixed. Aside from that, you also need to determine if the finish doesn’t sag nor drip. In this way, you ensure that the gutter sealant will last long and won’t need a re-touch anytime soon.

4. Durability

Durability of the gutter sealant is hard to test out unless you actually buy the product and apply it on your gutters. However, you can almost immediately tell if the sealant is durable if it:

  • Doesn’t crack
  • Doesn’t shrink
  • Doesn’t crumble

Moreover, a sealant can be deemed as durable if it is resistant to heat and cold. An ideal gutter sealant can resist hot weather of up to 40°C as well as extreme colds. Thus, if your sealant doesn’t dry up and crack in hot weather nor freezes up in the cold—you’ve got yourself a good deal.

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Nevertheless, I’ve only included gutter sealants that can withstand both extremes of temperature for your benefit.

Best Gutter Sealants

1. Oleum 265495 11-Ounce Leak Seal Flexible Rubber Sealant

The first product on our list is the Rust-Oleum Flexible Rubber Sealant which is incidentally one of the best sellers for gutter and roof sealants. It is especially designed for a versatile function, and is great for gutters, roofs, pipes, concrete, etc. Other than that, the rubber coating of this sealant is flexible, durable, as well as non-drip.


  • Semi-smooth finish
  • Can be coated with paint
  • Water-tight seal
  • Flexible material
  • Resistant to corrosion
  • Does not sag or drip


  • Fumes are a bit strong

2. Flex Seal Clear

We have another bestseller on our list, and that’s Flex Seal especially made for sealing leaks fast with a water-tight, flexible seal. It can work for a lot of surfaces other than gutters, such as roofs, concrete, or masonry. Needless to say, this product is another must-have in your garage to keep in handy in case there are any leaks in your gutter.


  • Water-tight, flexible seal
  • Multiple functions
  • Can be used to seal a variety of surfaces
  • Easy to use


  • Has a strong odor

3. Instant Gutter Seal

Are you looking for a gutter seal that dries fast and results in a permanent seal. Other than that, this gutter sealant works well on gutter leaks and narrow gutter seams. It is made of tripoylmer material that prevents the passage of air or water, which makes it great to seal away any type of moisture.


  • Compatible with almost any surface
  • Easy to clean
  • Fast-drying
  • Prevents passage of air and moisture
  • UV resistant
  • Can be painted over
  • Heat resistant
  • Can be used on wet surfaces


  • Has strong odor

4. General Electric GE5050 Aluminum and Metal Metallic, 10.1-Ounce

The GE entry in our best gutter sealant list is their aluminum and metallic sealant, which is especially designed for metal surfaces such as gutters, roofs, vehicles, and others. However, it can also be used for masonry, concrete, and other non-metal surfaces. The unique feature of this product is that it’s made of silicone, which is permanently waterproof and flexible.


  • Flexible and water-tight
  • Can be used for almost all surfaces
  • Easy to apply
  • 3-hour rain ready
  • Resistant to heat and freeze
  • Does not crack or crumble
  • Shrink-proof
  • Dries quickly


  • Finish is not as smooth as expected

5. DAP GE50G01 10.1 oz Clear Gutter Caulk

Another great product that we have to include in our list is the DAP Gutter Sealant. Aside from being adherent to most types of metals and surfaces, it is made of silicone that allows it to be as water-tight and air-tight as possible. This is the type of quality you need for gutters, roofs, and ceilings so that your problems will be fixed in no time.


  • Does not crack or shrink
  • Water-tight and air-tight
  • Flexible material
  • Can be used for gutters, downspouts, flashing
  • Can be used for most metal surfaces
  • Smell is not too strong
  • Especially durable


  • Can take a few hours to dry


All of the products on our list are without a doubt the best products available on the market today. However, there is one product that caught my attention because of its high quality and great sealing capacity (tried and tested by yours truly!).

For this particular buying guide, our number one product and top choice is the Rust-Oleum Rubber Sealant that is great for multi-purpose use. With one can of this product, you can use it to seal your gutters, roofs, ceilings, downspouts. Other than that, it can fill up any gap or hole in almost any type of material such as masonry, metal, or concrete.

On the other hand, if you’re looking for a best value product, I announce the best value gutter sealant for this list is the Flex Seal. Why? For its price and high quality, you get 14-oz of flexible, waterproof, and quick-drying sealant. Unlike the other products on the list, this affordable price already gets you 14 ounces instead of 10!

There we have our top 5 gutter sealants with their corresponding ratings and reviews. So, stop caulking your gaps or leaks and use an appropriate sealant instead. You can not only save money, but save time on the application as well.

If this article helped you make your choice, let us know by commenting your thoughts and suggestions below. Also, don’t forget to share this with your friends so that they can make the right decision, too! Thanks for reading our buying guide on the best gutter sealants!


  • Emma Clark

    Hi there! My name is Emma Clark, a part-time interior designer, house flipper, and full-time mom. This blog is the fruit of my extensive experiences as an interior designer and home improvement enthusiast. More so, I'm here to share with you a lot of great ideas on what you can do to make your home into a masterpiece: all cost-effective and amazingly creative.