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6 Best Gutter Sealants in 2024 – Reviews & Top Picks

Using metal epoxy to seal the joints between two pieces of gutter

Using metal epoxy to seal the joints between two pieces of gutter

Gutters are great when they are working properly. They keep your home dry and safe during wet weather. However, gutters do not work properly when they are leaking. The best way to prevent and fix leaky gutters is to seal them with a proper outdoor sealant. Sealing your gutters can prevent water from leaking out and ruining your gutter system. But what gutter sealants are the best? How do you know you are getting a good product that will actually work?

There are plenty of great gutter sealants available in 2022 that will get the job done. Here are the six best gutter sealants to buy in 2022, including reviews, pros and cons, and a buyer’s guide to choosing the best gutter sealant.

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A Quick Comparison of Our Favorites in 2024

Rating Image Product Details
Best Overall
Winner
Gorilla Waterproof Patch & Seal Liquid Gorilla Waterproof Patch & Seal Liquid
  • Extremely versatile
  • UV and weather resistant
  • Forms a very effective seal
  • Best Value
    Second place
    OSI GS121 Gutter and Seam Sealant Clear OSI GS121 Gutter and Seam Sealant Clear
  • Very affordable
  • Great for single leaks
  • Effective polymer resin base
  • Premium Choice
    Third place
    L R Liquid Rubber Waterproof Sealant L R Liquid Rubber Waterproof Sealant
  • Plenty of material
  • Detailed instructions provided
  • Environmentally friendly
  • Best Caulk
    Geocel 2320 Gutter Sealant Aluminum Geocel 2320 Gutter Sealant Aluminum
  • Made specifically for gutters
  • Adheres to most building materials
  • Can be used on flashing, roofs, shingles & more
  • Best Tape
    Gorilla Waterproof Patch & Seal Tape Gorilla Waterproof Patch & Seal Tape
  • Powerful tape fills gaps in minutes
  • Designed to fix outdoor leaks like on gutters
  • Can hold up to extreme temperatures & weather
  • The 6 Best Gutter Sealants

    1. Gorilla Waterproof Patch & Seal Liquid – Best Overall

    Gorilla Waterproof Patch & Seal Liquid

    Type: Liquid
    Base: Rubber
    Size: 1 pint

    Gorilla Waterproof Patch & Seal Liquid is a powerful liquid rubber sealant that is perfect for gutters. This liquid formula comes with the price and ease of rubber, but Gorilla has tweaked the formula, so it behaves like silicon. It is weather and UV-resistant, unlike pure natural rubber. Gorilla Waterproof Patch & Seal Liquid can be applied in a variety of different ways including with a brush, roller, or rag, or you can just pour it on. That makes it extremely versatile when it comes to plugging a variety of different gutter leaks. It also makes the product excellent for brand new gutters getting sealed for the first time. The product comes in three colors, black, white, or clear, and you can pick which one you need based on your gutters.  Because of its effectiveness and versatility, Gorilla Waterproof Patch & Seal Liquid takes the top spot for the best overall gutter sealant on the market right now.

    The biggest gripe with this product is the consistency. People do not expect Gorilla Waterproof Patch & Seal Liquid to be so thick, but it has the consistency of paint. Some cans show up with hard and congealed sections due to shipping which can make using the product difficult at times.

    Pros
    • Extremely versatile
    • UV and weather resistant
    • Forms a very effective seal
    • Easy to apply to gutters
    Cons
    • Thick consistency
    • Can congeal during shipping

    2. OSI GS121 Gutter and Seam Sealant Clear – Best Value

    OSI GS121 Gutter and Seam Sealant Clear

    Type: Squeeze tube
    Base: Polymer resin
    Size: 5 oz. tube

    If you are looking for a quick fix on a budget, you should consider looking into OSI GS121 Gutter and Seam Sealant Clear. This is a small tube of gutter sealant that is perfect for a small job. The tube is extremely small and very affordable. It will not do large jobs, but it is perfect for singular small leaks. Not everyone has a bunch of money to spend on leaky gutters, which is why this is the best gutter sealant for the money. The product is a hardy polymer resin that will quickly fill gaps. It is effective and great for single leaks or quick, cheap fixes.

    Do not use pictures as a reference. This is a small tube. Some people felt misled by the picture, but the size clearly states that it is 5 oz., which is small. It also suggests a cure time of 160 hours, which is a long time. That means for the best results, you should apply during a dry spell or dry season.

    Pros
    • Very affordable
    • Great for single leaks
    • Effective polymer resin base
    Cons
    • Very small tube
    • 160 hour suggested cure time

    3. L R Liquid Rubber Waterproof Sealant – Premium Choice

    L R Liquid Rubber Waterproof Sealant

    Type: Liquid
    Base: Rubber
    Size: 2 lbs.

    L R Liquid Rubber Waterproof Sealant is a simple and straightforward product. The can comes with two pounds of liquid rubber that is very easy to apply to gutters. The liquid rubber can be applied to the inside or underside of your gutters in minutes. Simply pour or roll on and wait for the rubber to cure. L R provides detailed instructions on how to get the best results out of their product, making it very easy to use. One can should be more than enough to seal all of your gutters. L R Liquid Rubber Waterproof Sealant is water-based, meaning it is environmentally friendly. It does not contain any harmful chemicals or VOCs. It is just water and rubber.

    Since this product is liquid rubber, it will shrink in the cold, which can cause cracking over time. It also does not apply well in humid weather meaning many people in the south will struggle to properly apply this product without any issues.

    Pros
    • Plenty of material to seal your gutters with one purchase
    • Detailed instructions provided
    • Environmentally friendly
    Cons
    • Shrinks in temperatures below freezing
    • Hard to apply in humid weather

    4. Geocel 2320 Gutter Sealant Aluminum – Best Caulk

    Geocel 2320 Gutter Sealant Aluminum

    Type: Caulk
    Base: Tripolymer
    Size: 10.3 oz. tube (x3)

    Geocel 2320 Gutter Sealant Aluminum is a caulk designed specifically for use on gutters. This sealant is self-leveling and can be used on wet, damp, or oily surfaces. It excels at sealing small gaps and keeps out dirt, water, and air. One great thing is that this sealant can also be used on roofs. It can bond to asphalt shingles, which allows you to also seal any leaks or gaps in your shingles as well as your gutters, giving you an all-around product that can tackle multiple jobs in one go. Since it can adhere to most types of building materials, you can also use it to seal your gutter’s flashing or behind your gutters, giving you a complete seal.

    The cons of Geocel 2320 Gutter Sealant Aluminum are the price and the fact that it cannot be used with large gaps. Most gutters should not have any gaps wider than ¼”, but in case you do, you will not be able to use this product. The price is a little high, though you do get three tubes in this pack. There are other products available for a more affordable price if you are on a budget.

    Pros
    • Made specifically for gutters
    • Adheres to most building materials
    • Can be used on flashing, roofs, shingles and more
    • Works really well compared to some products
    Cons
    • Expensive
    • Not great for large gaps or cracks

    5. Gorilla Waterproof Patch & Seal Tape – Best Tape

    Gorilla Waterproof Patch & Seal Tape

    Type: Tape
    Base: Butyl rubber
    Size: 4”x10’ roll

    Gorilla Waterproof Patch & Seal Tape is a tough adhesive tape designed for outdoor use. This tape is specifically designed to seal out water and fix leaks. Gorilla Waterproof Patch & Seal Tape is extremely thick and durable, bonds directly to your gutter’s surface, and creates a permanent seal in just two minutes. This tape can even be applied underwater, meaning that even if your gutters are a little damp, it should not jeopardize the seal. It can withstand temperatures that range from -70 to 200 degrees Fahrenheit, making it perfect for extreme outdoor weather. It is easy to press the tape into the joints of your gutter or downspout to create a solid seal that will last a long time.

    One of the biggest gripes with this tape is that it is extremely sticky. The tape can stick to your fingers and leave residue while you are trying to attach it. The stickiness is good in that it helps the tape bond quickly, but it can make a mess if you are not careful. Be sure to follow the instructions. Some people complain that the tape does not work without holding it in place for the full amount of time required for the bond to take.

    Pros
    • Powerful tape fills gaps in minutes
    • Designed to fix outdoor leaks like on gutters
    • Can hold up to extreme temperatures and weather
    • Can be applied to damp surfaces
    Cons
    • Can create a mess if you are not careful
    • Won’t work well if you don’t follow the instructions

    6. Flex Seal Spray Rubber Sealant Coating – Best Spray Sealant

    Flex Seal Spray Rubber Sealant Coating

    Type: Spray
    Base: Rubber
    Size: 14 oz. can

    Flex Seal Spray Rubber Sealant Coating is a simple spray-on rubber sealant that is great for sealing gutters. Flex Seal Spray Rubber Sealant Coating can be used while the gutters are on the ground, or it can be taken up the ladder and easily used on your leaky gutters. The can is small enough, and the installation is easy enough that toting it up a ladder and using it on gutter seals is simple. The product works well, and it is clear. It also comes in white in case you have white gutters. The final sealed product can be painted if necessary.

    One of the issues reported with this product deals with curing. Some people reported bubbles getting into the coating, which then popped and created holes and an improper seal. Others have reported that the sealant remains sticky and wet for far longer than it should, leading to incomplete seals. These issues are not widespread, but they do seem to crop up with certain batches.

    Pros
    • Easy to use
    • Effective for gutters
    • Dries clear
    • Paintable
    Cons
    • Sealant can get bubbles
    • Sealant takes a while to dry

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    Buyer’s Guide: Choosing the Best Gutter Sealants

    What Type of Sealant Is the Best?

    There is no one type of gutter sealant that is objectively better than the rest. Each sealant works differently and has its own benefits. The sealant that is the best for you is going to depend on what type of gutters you have, how big the leaks are, and the location of the leaks. Someone trying to seal new gutters is going to need a different product than someone trying to patch old gutters. If you are looking for one product that reigns supreme, there is none. Each product will excel in different situations from the others.

    Rubber vs. Silicone

    Most sealants are either rubber or silicone based. But what is the difference between the two? Rubber and silicon are very similar. Typically, silicone is more robust than rubber. Silicone lasts longer and holds up better to UV light and weather exposure, but silicon is also roughly double or even triple the price of rubber, so most people go with rubber rather than silicon. However, liquid silicone or silicone caulk will hold up better over time than rubber. Some people would rather reapply liquid rubber every three years than pay triple and have the sealant last six or seven years. That preference will depend on your budget and how often you want to potentially apply a rubber sealant.

    Consult a gutter installation expert

    Find a gutter specialist in your area, and get free, no-commitment estimates for your project.

    The Earlier, The Better

    The earlier you seal your gutters, the better. The best time to seal your gutters is during installation or shortly after. You do not want to wait to seal the gutters. The longer you wait, the more water, debris, dirt, dust, and grime can build up on the gutters, which will prevent a strong seal from forming. The dirtier and older the gutters, the harder it is to get something to bond to them. The best way to seal the gutters is when they are clean, smooth, and new.

    If you are choosing a sealant to patch old gutters that have developed leaks you should inspect the leaks to see how bad they are. That way, you can determine what type of sealant will work best for the type of leaks you have.

    Location, Location, Location

    One of the biggest factors that will decide what sealant is best for you is the location of your gutters and the location of the leaks. Do you have multiple leaks along a long length of gutter? Then you might want to get a liquid sealant that can be poured into the gutters or rolled on. Do you have a few problem spots along a curved portion of the gutter? Tape might work the best. Are your gutters high in the air? You might want to consider a spray that is easy to use on a ladder.

    Working on gutters can be dangerous and picking a product that is easy to apply in your specific situation can improve safety and results. Before making a final decision, consider where your gutters are located and where the worst leaks are happening.

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    Conclusion

    There are a variety of different gutter sealants that are each great in their own way. The best overall gutter sealant is the Gorilla Waterproof Patch and Seal Sealant. The best for the money is the OSI GS121 Gutter and Seam Sealant Clear. Some people are more comfortable with tape than caulk. Some people need a roll-on sealant for many new gutters. Whatever your need, skill level, or comfort level, there is a gutter sealant that will work great for you. You just have to choose one that fits your budget and project. Each one of these products should yield excellent results.


    Featured Image Credit: MDV Edwards, Shutterstock

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