Do you need to fix your leaky gutters as soon as possible? I have a fantastic solution: the best gutter sealants on the market can stop leaks in their tracks.
To create this list, I researched expert advice, genuine customer reviews, and my own expertise. After looking at each sealant’s make-up, cleaning ability, drying time, and other crucial details, I narrowed it down to the five top options.
Stick around to find a gutter sealant that works best for you, whether you need a super long-lasting liquid or something that dries extra fast.
- UV-stable
- Easy to apply on multiple surfaces
- Suitable both indoors & outdoors
- Seals out water, moisture & air
- Flexible, conforming to the holes
- Works underwater
- Plant & pet safe
- Smooth & fast seal
- UV-resistant
- Can be painted over once dry
- Useful for crafting and DIY
- Suitable for wet & dry surfaces
- Shrink & crack-proof consistency
- Lifetime guarantee
- Transparent color
Product Reviews
To create this list of the five best gutter sealants, I spent hours researching genuine customer reviews, expert advice, and each product’s unique specifications. This includes what type of sealant it is, what surfaces it adheres to, how long it takes to dry, and more.
Rest assured that these five options will help you patch up leaks and protect your home and garden. Let’s stick into it!
Liquid Rubber Waterproof Sealant
Best Liquid 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 for all jobs, from small projects at home to big projects at work, this is both a light and heavy-duty product to have in the shed. You can easily apply it with a brush or a roller, making it suitable for most family members to give it a go.
Customers enjoy that it’s a multi-surface and versatile product. You can use this wherever you spot a leak. It’s suitable for roofs, gutters, ponds, homes, metal, concrete, wood, plant boxes, and 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 that 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.
- Provides a protective finish on multiple surfaces.
- One thousand percent elongation to ensure it adheres for a long time.
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.
- Might flake off when used in or near ponds.
Product Specs
| Type | Liquid |
| Multi-Surface | Yes |
| Drying Time | 48+ hours, but may take longer |
| Flexible? | Yes, 1000 percent elongation |
| Quantity | Five gallons |
Our Ratings
Gorilla Waterproof Patch & Seal Tape
Most Flexible
While many of our findings include flexible sealants, this tape option goes the extra mile. You can use it in most places, 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 outdoor, and even underwater! It’s suitable for fixing pool liners, roofs, gutters, vehicles, and so much more.
It can withstand the test of time in various weather conditions. Customers appreciate that 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.
- Extra thick adhesion with UV-resistant backing.
- Available in black or white.
Cons
- Customers reported that it didn’t stick to pools for more than a few days.
- Stickiness means it’s hard to cut with scissors.
- Best on entirely flat surfaces rather than textured.
Product Specs
| Type | Tape |
| Multi-Surface | Yes |
| Drying Time | Instantly |
| Flexible? | Yes |
| Quantity | One pack (4 inches by 10 feet) |
Our Ratings
Flex Seal Liquid Rubber in a Can
Best Long Lasting Gutter Sealant
When you fix a leak with sealant, you want it to be a lasting solution. 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.
I appreciate 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 a versatile product. Of course, it works brilliantly on gutters. But it’s also suitable for vehicles, boats, birdbaths, pools, basements, and many more places.
Pros
- Plant and pet-safe.
- Apply with brush, roller, dipping, or pouring.
- Smooth and fast seal.
- UV-resistant, suitable for sunny areas.
- Lasts for years; great flexibility.
Cons
- You can’t paint over it.
- Sticky and glossy finish, which some people don’t like.
- Easy to peel off once it’s dry.
Product Specs
| Type | Liquid |
| Multi-Surface | Yes |
| Drying Time | 24-48 hours, but may take longer |
| Flexible? | Yes |
| Quantity | 16 ounces |
Our Ratings
Flex Seal Spray Rubber Sealant
Best Spray Sealant
This sealant is a liquid rubber. It exits the can 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, this is a fantastic product.
Once you’ve applied it, it should last for years, so you don’t have to worry about many touch-ups. It’s also available in 12 colors, so you can find one that matches your chosen surface. If you don’t like any of the colors, you can paint right over it once it’s dry!
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.
- Twelve color options, plus it can be painted over once dry.
- Can be used for crafting as well as DIY.
- Suitable for wet and dry surfaces.
- Spray option that dries into a rubber coating.
- Flexible and pliable for years.
Cons
- Very thin consistency, so needs multiple coats and may go runny.
- No UV protection; may crack in direct sunlight.
- Hazardous chemicals included.
Product Specs
| Type | Spray |
| Multi-Surface | Yes |
| Drying Time | 24-48 hours |
| Flexible? | Yes |
| Quantity | 14 ounces (2 pack) |
Our Ratings
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! Not even rain can ruin this fresh coat.
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 is a versatile product that you can use on all gutters in various areas.
Keep In Mind
In general, this is suitable for areas 0 to 140 degrees Fahrenheit. 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 140°F.
- Transparent color for aesthetic purposes.
- Won’t shrink or crack.
Cons
- Can’t be used in conditions less than 0°F.
- Hard to squeeze out the tube.
- No UV protection.
- Exterior surfaces only.
Product 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 |
Our Ratings
| Product | Best | Type | Multi-Surface | Drying Time | Flexible? | Quantity |
|---|---|---|---|---|---|---|
| Liquid Rubber Waterproof Sealant | Liquid Sealant | Liquid | Yes | 48+ hours | Yes | 5 gal. |
| Gorilla Waterproof Patch & Seal Tape | Flexible | Tape | Yes | Instantly | Yes | 4″ x 10′ |
| Flex Seal Liquid Rubber in a Can | Long Lasting Gutter Sealant | Liquid | Yes | 24-48 hours | Yes | 16 oz |
| Flex Seal Spray Rubber Sealant | Spray Sealant | Spray | Yes | 24-48 hours | Yes | 14 oz (2-pack) |
| DAP Crystal Clear Gutter Sealant | Quick Drying Gutter Sealant | Paste | No | 30 minutes | Yes | 9 oz |
Key Features to Look For
Are all gutter sealants the same? Nope! Consider these essential criteria to ensure you choose the best sealant for your situation.
Type
First, consider what type of sealant you want. This will help you narrow down your choice and ensure you get one you’re happy using.
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.
There are paste-type sealants that resemble caulk, which come out of a squeezy tube and are thicker. They are long-lasting and usually dry more quickly.
Versatility
Many gutter sealants are usually designed for a variety of surfaces. This includes roofs, wood, concrete, metal, boats, skylights, chimneys, pool liners, vehicles, and more. Always check what each gutter sealant is compatible with (I’ll also let you know).
You should also check if the sealant works in wet and dry conditions. This is very important if you live in an area with shifting weather conditions.
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, choose one with a shorter drying time.
Keep In Mind
Many factors can affect the advertised drying times. This includes the temperature, humidity, wind conditions, surface sealed, and more.
Adhesion Strength
It’s important to note how well the product will adhere to the surface. You can measure adhesion strength by how resistant the product is to certain elements such as 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 adhere to silicone or water-repellent surfaces.
The more adhesive a sealant 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 to the application. You want something 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.
FAQs About Gutter Sealants
Is Flex Seal Good for Gutters?
My research found that Flex Seal is one of the best brands for sealing your gutter. That’s why there are two recommendations on this list.
Flex Sealhase has many options, 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, use a brush or roller to apply the product to the hole.
With sprays, simply spray the area.
You can squeeze pastes directly 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.
According to our research, customers reported sealant would last between one and four years. 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.
- Use a sharp knife to cut along the sealant at the sides and back.
- Use a flat chisel to lift the loosened sealant.
- Continue until you’ve removed most of it.
- Use a scraper to remove any residue.
- Pour methylated spirits on a cloth (wearing gloves) and clean 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.
Can Silicone Sealant Be Used on Gutters?
Silicone sealant can be used on gutters, provided that the surface is clear, so the sealant gets the best bond.
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.
