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Best Gutter Sealants of 2021

Updated
Fix those leaky holes ASAP. 

Do your leaky gutters need to be fixed as soon as possible? You need some of the best gutter sealants on the market. These products will help you stop leaks in their tracks without wasting any more time!

We’re here to help. We’ve researched genuine customer reviews, expert advice, and applied our own insight to create this list of the five best gutter sealants.

Our Top Picks

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Model
Product Comparison Table
Features

Product Image of the Liquid Rubber Waterproof Sealant - Multi-Surface Leak Repair Indoor and Outdoor Coating, Water-Based, Easy to Apply, Original Black, 5 Gallon
Best Liquid Gutter Sealant
Liquid Rubber Waterproof Sealant
  • UV stable
  • Easy to apply on multiple surfaces
  • Suitable both indoors & outdoors
Product Image of the Gorilla 101895 Waterproof Patch & Seal Tape, 1-Pack, White
Best Flexible Gutter Sealant
Gorilla Waterproof Patch & Seal Tape
  • Seals out water, moisture & air
  • Flexible, conforming to the holes
  • Works underwater
Product Image of the Flex Seal Liquid Rubber in a Can, 16-oz, Clear
Best Long Lasting Gutter Sealant
Flex Seal Liquid Rubber in a Can
  • Plant & pet safe
  • Smooth & fast seal
  • UV-resistant
Product Image of the Flex Seal Spray Rubber Sealant Coating, 14-oz, White (2 Pack)   - FSWHTD20
Best Spray Sealant for Gutters
Flex Seal Spray Rubber Sealant
  • Can be painted over once dry
  • Can be used for crafting
  • Suitable for wet & dry surfaces
Product Image of the DAP 18377 3.0 Crystal Clear Premium Gutter and Flashing Sealant, 9 oz, Crystal Clear
Best Quick Drying Gutter Sealant
DAP Crystal Clear Gutter Sealant
  • Shrink & crack-proof consistency
  • Lifetime guarantee
  • Transparent color

How to Find the Best Gutter Sealants

Are all gutter sealants the same? Nope! You should consider these essential criteria before buying to ensure you get a sealant that works well for your situation.

Type

First, consider what type of sealant you want.

Liquid sealants are affordable and easy to apply with a brush or roller. Many are water-based without added chemicals, making them non-toxic and eco-friendly.

Spray sealants are extra easy to use since you just aim at the leak and spray. They are a bit more expensive and may run out quicker, but they’re less messy to use.

You’ll also find gutter sealant tapes. Tape over the leak and stop it in its tracks. These aren’t always the strongest types of sealants, but they’re flexible and versatile. They allow you to work in tight corners across many different surfaces.

Lastly, there are paste-type sealants that resemble caulk. They’re thicker and come out of a squeezy tube. These are very long-lasting and usually are a bit more quickly drying.

Decide which sounds best for you before shopping! This will help you narrow down your choice and ensure you get one that you’re happy using.

Versatility

If you only have one little leak, it can seem like a waste buying a sealant that you won’t be able to use again. Well, thankfully, gutter sealants are usually designed for a variety of surfaces. This can include roofs, wood, concrete, metal, boats, skylights, chimneys, pool liners, vehicles, and much more.

You should also check if the sealant works in wet and dry conditions. If you live in an area with shifting weather conditions, this is very important.

Lastly, check if it’s possible to paint over the sealant. This is very important for many people as it will disguise the appearance of the sealant and blend it in.

Drying Time

The drying time changes depending on the product at hand. Many take between 24 and 48 hours, whereas others can take as little as 30 minutes! If you want to paint over your sealant as soon as possible or simply don’t want to wait long for it to dry, we recommend choosing one with a shorter drying time.

Keep In Mind

Many factors can affect drying times. This includes the temperature, humidity, wind conditions, surface sealed, and more. So, just because the manufacturer states a drying time, it doesn’t mean that’s what it’ll be.

Adhesion Strength

It’s important to note how the product was designed and how well it will adhere to the surface. Adhesion strength can be measured by how resistant the product is to certain elements. You should check if it’s resistant against things like UV rays, water, salt, temperature changes, chemicals, and more.

Also, check if the sealant can be applied to your surfaces. Some sealants, such as tape, cannot be adhered to silicone or water-repellent surfaces.

The more adherent it is, the longer it will last since it can resist daily elements.

Flexibility

This is a crucial factor for a sealant. You will want something that can shift with minor structural changes, temperature changes, and various other gutter issues. This ensures that it will keep containing the leak.

Flexibility is also vital with the application. You want something that is easy to apply to all sizes and shapes of leaks. For instance, tape is a very flexible sealant since you can situate it however you like over various types and sizes of leaks.

Odor

Many people opt for a low odor sealant as this reflects that there are fewer chemicals in the product. Check out what other customers say about the odor. Usually, if there is an odor, it won’t last much longer than the drying time.


The Best Gutter Sealants of 2021

Here are five reliable gutter sealants for your home.

Liquid Rubber Waterproof Sealant

Best Liquid Gutter Sealant

This non-toxic, water-based liquid sealant from Liquid Rubber is just the thing for fixing leaks. It creates a watertight seal to prevent moisture from leaking through.

Suitable from small projects at home to big projects at work, this is both a light and heavy-duty product to have in the shed. It can easily be applied with a brush or a roller, making it suitable for most people in the family to give it a go.

We love that it’s a multi-surface and versatile product. You can basically use this wherever you spot a leak. It’s suitable for roofs and gutters, ponds, homes, metal, concrete, wood, plant boxes, and much more.

As mentioned, flexibility is a crucial feature to look for in a sealant, and this one ticks that box. It has over 1000 percent elongation, allowing it to hold the seal even if there is movement on your chosen surface.

Top Tip

As an extra measure, you can add Liquid Rubber Seam Tape or Geo-Textile over the sealant.

Pros

  • UV stable, so it can withstand the sun.
  • Easy to apply with brush, roller, or piston paint sprayer.
  • Suitable both indoors and outdoors.
  • Multi-surface so can be used practically anywhere.

Cons

  • May take more than 48 hours to dry in cold or humid weather.
  • The paint goes black or brown when dry, which is unsightly for some.
  • If using in a pond, be prepared for it to flake off.

Additional Specs

Type Liquid
Multi-Surface Yes
Drying Time 24-48 hours, but may take longer
Flexible? Yes, 1000 percent elongation
Quantity Five gallons

Gorilla Waterproof Patch & Seal Tape

Best Flexible Gutter Sealant

While many of our findings include flexible sealants, this one goes a bit further since it’s a tape. You can use it pretty much anywhere, building it up where you have more intense cracks and holes. It’s been designed to conform to various surfaces to ensure an end to those pesky leaks.

As well as being flexible, it’s very versatile. You can use this tape both indoors and outdoors, and even underwater! It’s suitable for fixing pool liners, roofs, gutters, vehicles, and so much more.

It’s also designed to withstand the test of time in various weather conditions. We already know it’s suitable for both wet and dry areas, but it’s also safe in sunlight. It has a UV-resistant backing, ensuring it stays adhered to your chosen surface even in those conditions. As for temperatures, it works in temperatures from -70 to 200°F. Wow! Now that’s versatile.

Pros

  • Suitable on multiple surfaces including wood, glass, acrylic, and more.
  • Seals out water, moisture, and air.
  • Flexible, conforming to the holes both indoors and outdoors.
  • Works underwater.

Cons

  • Customers reported that it didn’t stick to pools for more than a few days.
  • Not easy to cut off with scissors as it’s so sticky.
  • Best on entirely flat surfaces rather than textured.

Additional Specs

Type Tape
Multi-Surface Yes
Drying Time Instantly
Flexible? Yes
Quantity One pack (4 inches by 10 feet)

Flex Seal Liquid Rubber in a Can

Best Long Lasting Gutter Sealant

When you fix a leak with sealant, ideally, it’s not a temporary fix. You want something that lasts a long time. Customers say this Flex Seal product lasts many years, ensuring your leaks won’t return for a while!

The reason it lasts so long is that it is flexible, ensuring that it will shift alongside any structural changes. It also creates a watertight seal so that all water and moisture can remain out. Last but not least, it’s resistant to rust, chemicals, mildew, and corrosion. It’s a very durable concoction that can last the test of time.

We also love that it’s a non-toxic and animal-safe product. Many sealants are made with harsh chemicals, but not this one. So even if a curious bird has a sniff or peck around the sealant, it won’t harm them.

Last but not least, this is another versatile product to consider. You can use it happily on your gutters. But why not put it to use in other areas? It’s suitable for vehicles, boats, birdbaths, pools, basements, and many more places.

Pros

  • Plant and pet safe.
  • Can be applied with brush, roller, dipping, or pouring.
  • Smooth and fast seal.
  • UV-resistant, suitable for sunny areas.

Cons

  • It can’t be painted over.
  • Sticky and glossy finish, which some people don’t like.
  • Easy to peel off once it’s dry.

Additional Specs

Type Liquid
Multi-Surface Yes
Drying Time 24-48 hours, but may take longer
Flexible? Yes
Quantity 16 ounces

Flex Seal Spray Rubber Sealant

Best Spray Sealant for Gutters

Spray on sealants are very easy to use and apply to your chosen surface. If you’re after a spray option, then you might like Flex Seal Spray Rubber Sealant.

Inside the can is basically liquid rubber. It comes out as a liquid and instantly seeps into cracks and holes before drying into a protective and watertight coating. If you need to stop leaks quickly, then this is a fantastic product to consider.

Once you’ve applied it, it should last for years, so you don’t have to worry about many touch-ups. Another great thing is that it’s available in 12 different colors, so you can find one that matches your chosen surface. If you don’t like any of the colors, once it’s dry, you can paint right over it!

This is also a terrific multi-surface option. It’s suitable for gutters, of course, but also windowsills, awnings, vehicles, roofs, and much more.

Pros

  • Super easy to apply.
  • 12 color options, plus can be painted over once dry.
  • Can be used for crafting as well as DIY.
  • Suitable for wet and dry surfaces.

Cons

  • Very thin consistency, so needs multiple coats and may go runny.
  • No UV protection; may crack in direct sunlight.
  • Hazardous chemicals included.

Additional Specs

Type Spray
Multi-Surface Yes
Drying Time 24-48 hours
Flexible? Yes
Quantity 14 ounces

DAP Crystal Clear Gutter Sealant

Best Quick Drying Gutter Sealant

If the average 24-48 hour wait time is too long for you, check this DAP gutter sealant out. The drying time is only 30 minutes! After that, it’s ready to be rained on, let alone just being completely dry. You can even paint over it after 30 minutes. Super speedy.

This product is also 100 percent weatherproof and waterproof, so it will stand the test of time no matter where you live. As someone who lives in a super rainy country, this sounds like a magic product.

Easily apply this to both wet or dry surfaces. This ensures this is a versatile product that can be used on all gutters in various areas.

Keep In Mind

In general, this is suitable for areas 20 to 120 degrees Fahrenheit. So if you do live in a particularly cold place, keep in mind that this may not be the right product for you.

Pros

  • Shrink and crack-proof consistency.
  • Lifetime guarantee for your confidence.
  • Suitable for both wet and dry surfaces up to 120°F.
  • Transparent color for aesthetic purposes.

Cons

  • Can’t be used in conditions less than 20°F.
  • Hard to squeeze out the tube.
  • No cap included, so it dries over if you don’t cover it.
  • No UV protection.

Additional Specs

Type Paste
Multi-Surface No, gutters and flashing only
Drying Time 30 minutes
Flexible? Somewhat — it’s crack and shrink-proof
Quantity 9 ounces

Gutter Sealant Comparison Chart

Product Best Type Multi-Surface Drying Time Flexible? Quantity
Liquid Rubber Waterproof Sealant Best Liquid Gutter Sealant Liquid Yes 24-48 hours Yes 5 gal.
Gorilla Waterproof Patch & Seal Tape Best Flexible Gutter Sealant Tape Yes Instantly Yes 4″ x 10′
Flex Seal Liquid Rubber in a Can Best Long Lasting Gutter Sealant Liquid Yes 24-48 hours Yes 16 oz
Flex Seal Spray Rubber Sealant Best Spray Sealant Spray Yes 24-48 hours Yes 14 oz
DAP Crystal Clear Gutter Sealant Best Quick Drying Gutter Sealant Paste No 30 minutes Yes 9 oz

FAQs About Gutter Sealants

Is Flex Seal Good for Gutters?

Our research showed us that Flex Seal is one of the best brands for sealing your gutter, and we actually have two recommendations on our list. They have many options available, including different types of sealants. You’ll also find plant and pet safe options, although some of their products do contain hazardous chemicals.

How Do You Seal a Leaking Gutter?

Depending on what product you choose, the instructions will vary. Liquid, spray, paste, and tapes are all applied differently so make sure to read the manufacturer’s guidelines.

With liquid sealants, you can use a brush or roller to apply the product to the hole.

With sprays, simply spray the area.

Pastes can be squeezed into the cracks and holes.

Cut your tape and apply it over the cracks and holes, ensuring to hold down the tape for a few minutes so that it adheres well.

How Long Does Gutter Sealant Last?

It’s tough to put a number on this because it changes depending on the product and the conditions. If you live somewhere with extreme weather conditions, it may not last as long. In general, customers reported sealant would last between one and four years, according to our research. But some brands offer a lifetime guarantee.

How Do You Remove Old Gutter Sealant?

Gutter sealant can be tough to remove. Read the user manual for the manufacturer’s specific advice.

You could try using a sharp knife, flat chisel, a scraper, and methylated spirits.

  1. Use a sharp knife to cut along the sealant at the sides and back.
  2. Use a flat chisel to lift up the loosened sealant.
  3. Continue until you’ve removed most of it.
  4. Use a scraper to remove any residue.
  5. Pour methylated spirits on a cloth (wearing gloves) and clean up the area.

How Much Does It Cost to Seal Gutters?

If you’re doing it yourself, the cost of the sealant varies from around $7 to $30. This depends on the product and the amount you’re buying.

If you hire someone to seal your gutters, expect the cost to be higher. This is because they would rather repair or replace the gutters rather than seal them. This usually costs between $100 and $200, depending on the size of your gutters (1).

Should Gutters be Caulked?

Yes. If a professional installed your gutters, they’re likely already caulked, but it’s important to maintain the caulk. Caulking a gutter uses a substance to fill in the gaps to prevent rust, fungi, leaves, and other debris from building up in the cracks, holes, and gaps.


Gutter Guide

When it comes to gutters, a small problem can quickly lead to a massive issue. If you spot a leak, it’s better to seal it as soon as possible, even if you’re later planning to get a professional repair person in.

When buying a gutter sealant, make sure you consider the most important details. This includes the type, what surfaces it works on, the drying time, flexibility, durability, odor, versatility, and quantity.

Headshot of Beth McCallum

About the Author

Beth McCallum

Beth McCallum is a 20-something freelance writer & book blogger with a degree in creative writing, journalism and English literature. Beth firmly believes that a tidy house is a tidy mind. She is always looking for new ways to sustainably clean and tidy her house, that's kind on the environment but effective in the house, too!