Finding the perfect gutter sealant can be exceptionally difficult when you’re faced with so many options and no ability to test them before making a purchase. That’s where we come in – we’ve researched dozens of options and simplified them into a simple list of 5 gutter sealants that you can buy right now.
- GE Metal Silicone Sealant Caulk is the best value for your money.
- Best for Spray-on Application – Rust-Oleum Flexible Rubber Coating Spray
- Best for Different Kinds of Surfaces – Gorilla Clear Silicone Sealant Caulk
- Best for Wet Surfaces – Geocel Instant Gutter Seal
- Best for All Temperatures – DAP Premium Gutter Sealant
Our Top Overall Pick
- Gorilla Clear Silicone Sealant Caulk is our top, all-around pick based on value, utility and durability.
|Gorilla Clear Silicone Sealant Caulk||Check Price|
|Rust-Oleum Flexible Rubber Coating Spray||Check Price|
|Geocel Instant Gutter Seal||Check Price|
|DAP Premium Gutter Sealant||Check Price|
|GE Metal Silicone Sealant Caulk||Check Price|
Top 5 Best Gutter Sealants for Leaky Roofs
1. Gorilla Clear Silicone Sealant Caulk – Best for Different Kinds of Surfaces
- Size: 10 ounces.
- Indoor and outdoor use.
- Mold and mildew resistant.
- Doesn’t crack over time.
- Won’t discolor or turn yellow.
- Price: Check Price
Gorilla brand silicone gutter seal is a great all-in-one product that is designed for a variety of uses. From indoor window leaks to roof gutters, this product can handle it all. The sealant is 100% waterproof, won’t crack or turn yellow from discoloration over time and is completely mold and mildew resistant which makes it an excellent versatile choice if you need to seal multiple surfaces.
Before applying be sure to thoroughly clear the surface of any grease or dirt and apply in temperatures of 40 degrees or higher for the best possible results. To apply, simply insert into your caulk gun and cut the tip to adjust for your desired flow rate and it should dry completely in 30 minutes to an hour and form a completely watertight seal.
It’s worth pointing out before you order that while the caulk sealant is great and works wonders, the actual container it comes in is extremely poor quality. It’s not uncommon for the bottom to completely fall out during shipping or after storing for awhile so it may ship as defective.
- Easy to apply with a caulk gun.
- Works on indoor/outdoor surfaces.
- Resists mold and mildew.
- Won’t discolor over time.
- The container is poorly made and may break during shipping.
- Cannot be painted over.
- Smells like vinegar.
2. Rust-Oleum Flexible Rubber Coating Spray – Best for Spray-on Application
- Size: 12 ounces.
- Dries in 30 minutes.
- Can cover 8 square feet of surface.
- Designed for both exterior and interior use.
- Price: Check Price
Thanks to Rust-Oleum’s special rubberized formula, their rubber coating spray allows you to quickly seal leaky cracks while simultaneously creating a waterproof barrier. Their flexible sealant can be used on either interior or exterior surfaces and dries in 30 minutes which is perfect for do-it-yourself projects.
Each 12 oz can is enough to fix 8 square feet of leaky gutters with a tight waterproof seal. Rust-Oleum is the perfect choice for difficult to reach areas of your gutter that tend to spring leaks and it can even help prevent corrosion and rust.
While the sealant is moisture resistant, it does tend to peel off if not evenly layered so you’ll want to make sure to shake the can well and apply evenly along the surface to prevent any chipping off. And depending on how much of your gutter is leaking you may need a couple of cans as one can is only designed to cover 8 square feet of surface area.
- Easy DIY application.
- Dries in 30 minutes to an hour.
- Can be used on a variety of surfaces, not just gutters.
- Must shake very well before use or it clumps.
- Has to be evenly layered or the sealant can peel off over time.
3. Geocel Instant Gutter Seal – Best for Wet Surfaces
- Size: 5 ounces.
- Cannot be bought in California.
- Made specifically for gutters.
- Easy to apply.
- Price: Check Price
Geocel’s instant gutter seal is specifically designed for gutters but it can be applied to most outdoor surfaces you can think of – it even works on aluminum and other metal surfaces. If you live in an area with wildly fluctuating temperatures then this is definitely the choice for you as it’ll hold up well through a variety of elements.
While the sealant works well with any temperature, you’ll want to keep the actual tube at room temperature before applying or it may become stuck in the tube. That being said, you can safely apply Geocel’s gutter seal even in wet conditions without any problems though we do recommend you use gloves so you can smooth the sealant after application.
For the amount you receive it is a bit expensive though. It also doesn’t have an adjustable nozzle so it may be difficult to adjust how much sealant you squeeze out when applying, but if you wear gloves you can easily smooth out the surface after applying.
- Designed specifically for roof gutters.
- Works well on aluminum and metal gutters.
- Can last through both hot and cold weather.
- A bit expensive for the amount received.
- Needs to be kept at room temperature before applying and you cannot adjust the nozzle.
- Unavailable in California.
4. DAP Premium Gutter Sealant – Best for All Temperatures
- Size: 9 ounces.
- Exterior use only.
- Low odor.
- Works at extreme temperatures (20-120 degrees).
- Clear color for easy concealing.
- Price: Check Price
DAP’s premium gutter sealant sets itself apart from the others on this list by being easily usable in all temperatures. It’s also clear and paintable which makes it very easy to conceal. To apply, simply place into your caulk gun and cut the tip to the desired width and get to sealing! Keep in mind though that it doesn’t come with a cap so it will dry out pretty quickly after opening.
It also has a much more manageable odor compared to some of the others we’ve reviewed. Keep in mind though that you can only apply it outdoors so we don’t recommend you use this product on anything other than your gutters. It also won’t shrink over time which helps ensure leaks will stay sealed over time without having to be constantly reapplied.
The biggest downside of DAP gutter sealant is that the tube will quickly dry out after opening so it doesn’t store well over time. That’s why we recommend you wait until you have enough leaks to seal all at once, otherwise any leftover sealant left in the tube will likely go to waste and have to be discarded.
- Easy to hide thanks to it’s clear color.
- Doesn’t smell bad.
- Can only be used outdoors.
- Dries out quickly after opening since there’s no cap.
- Can discolor or turn yellow over time.
5. GE Metal Silicone Sealant Caulk – Best for Metal Gutters
- Size: 10.1 ounces.
- Resistant to mold.
- Full cure within 24 hours.
- Price: Check Price
If you have a metal roof or gutter then GE’s silicone caulk is the choice for you. Specifically made to seal metal such as aluminum and steel, this is a great choice if you’re worried about fixing your leaks without leaving blemishes or discoloration while simultaneously preventing mold for at least ten years.
We wouldn’t recommend this caulk sealant for any surfaces other than metal, however. While it may be usable on a few different surfaces such a brick and masonry, it isn’t the best choice for anything other than metal. It also cannot be painted over which means it may stand out after application if not carefully hidden or applied to the interior of your gutter.
- Designed for metal roofs and gutters.
- Won’t cause mold.
- Cannot be painted over.
- Takes 24 hours to fully cure.
Out of the hundreds of gutter sealants available online right now, the 5 we outlined above are hands down the best options you can buy today. And out of that 5 we crown the Gorilla Clear Silicone Sealant Caulk as the best overall.
Unless you need a gutter sealant specifically for spray-on application, in which case we recommend the Rust-Oleum Flexible Rubber Coating Spray. And for different kinds of surfaces you should probably go with the Gorilla Clear Silicone Sealant Caulk.
If you still haven’t made up your mind as to which gutter sealant you want then you should probably determine which aspects are the most important to your needs. To that end we have briefly summarized the key differences to hopefully make your purchase a bit easier.
Gutter sealants come with many different application methods – some can be sprayed on while others require a caulk gun. Make sure you buy the one that’s best suited for your needs and keep in mind regardless of which you choose you may need to smooth by hand which may require latex gloves.
Types of Surfaces
While most gutters are metal, you may want to use this sealant on other surfaces as well so pick up the one specifically designed for the surfaces you plan on using it on. Some are specifically designed for aluminum or steel while others will work well on plastic or even siding so be sure to get the one that best matches your requirements.
One of the most common problems with gutter sealant is that over time it can chip or peel away. It can also slowly turn yellow due to UV damage so unless it’s concealed inside the gutter you may want to choose an option that won’t discolor over time.
Most gutter sealants claim that they can be applied in as little as 30 minutes, but it’s still a good idea to give it a few hours buffer time to give the seal some time to cure. This isn’t as applicable if the sealant is weather-proof or can be applied in wet conditions but you’ll need to check with the manufacturer to be sure.
Depending on whether your sealant is made for indoor or outdoor use, some sealants may not work as effectively under large temperature fluctuations. Check the manufacturers recommended temperature rating and compare that to your environment to ensure that the sealant can withstand anything mother nature throws at it!
Be sure to check whether or not the manufacturer offers a warranty on the item you intend to purchase. While Amazon should cover broken or defective items upon delivery, it’s up to the manufacturer as to whether they will provide a replacement after it’s been used. Compare different gutter sealant sellers to see if any of them will offer replacements in the event it breaks from normal use.
Even if everything works properly, you may discover you’ve ordered the wrong gutter sealant for your needs which may require a return. Be sure to check with the vendor before purchasing to see if they will allow a return and if so, under what circumstances.
Shipping is easily one of the most annoying costs associated with making online purchases. Be sure to compare the shipping costs to your location prior to making a purchase so you don’t end up spending more than you bargained for.
Frequently Asked Questions
Which gutter sealant is the cheapest?
If you’re shopping for the lowest priced gutter sealant you can find then we recommend the GE Metal Silicone Sealant Caulk. Of all the gutter sealants we’ve reviewed, none of the others can beat it’s price.
What is gutter sealant?
Gutter sealant is a specially formulated substance that is specifically designed to repair leaks or holes in your roof gutters. They come in a variety of application methods and work differently on different surfaces so be sure to select the right one for your specific needs.
How long does gutter sealant last?
This varies wildly depending on the formula – some are made of rubber like substances while others use silicone. Generally speaking, gutter sealant lasts for anywhere from 3-5 years and can increase the lifespan of your gutters by 10 years or more.
How do I stop my gutters from leaking?
Pick up one of the gutter sealants we recommended above and apply liberally to any holes or leaky areas to massively increase the longevity and effectiveness of your gutters. You may also want to look into picking up a gutter brush guard which can passively prevent your gutters from filling up with debris that could cause blockages or clogs.
- 10 Gutter Installation Tips from the Pros
- Installing Half Round Gutters and Downspouts
- How to Repair a Leaky Gutter
What Do You Think?
What do you think about our choice for the best gutter sealant? If there are any gutter sealants you’d like us to review please leave a comment below and let us know and we may add it to our list!
Juan González founded the Greater Miami Landscaping Company 9 years ago and has managed it ever since. A prolific contributor to Consumer Prodigy and our resident expert in all things green, Juan has an advanced technical knowledge of outdoor equipment and greens-keeper machinery. You can read more about Juan on his author bio page or via Twitter @GreaterMiamiLandscapingCo.