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Flex Seal Liquid, 16 oz, Black, Liquid Rubber Coating Sealant, Waterproof, Flexible, Breathable, and UV Resistant, Roof Repair, Basements, RV, Campers, Trailers, Marine, EPDM, Masonry

4.4 4.4 out of 5 stars 1,798 ratings
Amazon's Choice highlights highly rated, well-priced products available to ship immediately.
Amazon's Choice in Hardware Sealers by Flex Seal Liquid

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Available at a lower price from other sellers that may not offer free Prime shipping.
Black
Rubber

Purchase options and add-ons

Material Rubber
Brand Flex Seal Liquid
Style Protective
Item Weight 1 Pounds
Item Dimensions LxWxH 3.38 x 3.38 x 4 inches

About this item

  • Pour, Brush Or Roll On With Roller
  • Non-Toxic, Easy To Use
  • Seeps Into Cracks & Holes, Seals Out Water
  • Lasts For Years, Stays Flexible & Pliable
See more product details

Additional Details

Small Business
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Small Business
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Customer ratings by feature

Water resistance
4.5 4.5
Easy to use
4.1 4.1
Adhesion
4.1 4.1
Value for money
3.8 3.8

Frequently bought together

$20.67 ($1.29/Fl Oz)
Get it as soon as Wednesday, Mar 27
In Stock
Ships from and sold by Amazon.com.
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$7.99
Get it as soon as Wednesday, Mar 27
In Stock
Sold by Pro-Grade Supplies and ships from Amazon Fulfillment.
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Flex Seal Liquid, 16 oz, Black, Liquid Rubber Coating Sealant, Waterproof, Flexible, Breathable, and UV Resistant, Roof Repair, Basements, RV, Campers, Trailers, Marine, EPDM, Masonry
Flex Seal Liquid , 16 oz, Black, Liquid Rubber Coating Sealant, Waterproof, Flexible, Breathable, and UV Resistant, Roof Repair, Basements, RV, Campers, Trailers, Marine, EPDM, Masonry
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Flex Seal Liquid, 1 Gallon, Gray, Liquid Rubber Coating Sealant, Waterproof, Flexible, Breathable, and UV Resistant, Roof Repair, Basements, RV, Campers, Trailers, Marine, EPDM, Masonry
Details
Added to Cart
Details
Added to Cart
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Price-36% $20.67
List:$32.46
-16% $29.24
List:$34.99
$34.94$33.55-5% $33.26
List:$34.99
$109.99
Delivery
Get it as soon as Wednesday, Mar 27
Get it as soon as Wednesday, Mar 27
Get it as soon as Wednesday, Mar 27
Get it as soon as Wednesday, Mar 27
Get it as soon as Wednesday, Mar 27
Get it Mar 27 - 29
Customer Ratings
Water resistance
4.5
4.3
4.1
4.5
4.1
4.5
Easy to use
4.1
3.9
4.0
4.3
3.9
4.3
Adhesion
4.1
4.4
4.0
4.3
4.3
4.3
Value for money
3.8
3.8
3.3
4.1
5.0
4.1
Durability
3.7
4.2
4.2
Sold By
Amazon.com
Amazon.com
Amazon.com
Amazon.com
Amazon.com
The Factory Depot
material
Rubber
Hybrid
Hybrid
Rubber
Hybrid
form
Liquid
Liquid, Spray
Liquid, Spray
Liquid
Liquid, Spray
Liquid
surface suggestion
Roof
Window, Floor, Gutter, Tile
Window, Floor, Gutter, Tile
Roof
Roof, Gutter, Window, Tile
Roof
compatible material
Paper, Metal
Rubber, Metal, Glass, Concrete, Aluminum
Polyvinyl Chloride, Metal, Concrete, Wood, Aluminum
Alloy Steel
Rubber, Metal, Glass, Concrete, Aluminum
Rubber
stain resistant
water resistance
waterproof
waterproof
waterproof
waterproof
waterproof
waterproof

Product information

Technical Details

Additional Information

Warranty & Support

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Flex

Flex Seal Liquid, 16 oz, Black, Liquid Rubber Coating Sealant, Waterproof, Flexible, Breathable, and UV Resistant, Roof Repair, Basements, RV, Campers, Trailers, Marine, EPDM, Masonry


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Product Description

Flex Seal Liquid - It's Liquid Rubber in a Can!
Group picture of various sizes and colors of Flex Seal Liquid

FLEX SEAL LIQUID is thick rubberized liquid that you can brush, roll, dip or pour to form a durable, watertight flexible barrier. Seals out air, water and moisture. Chemical and UV resistant. Available in black, white, clear and gray.

Advantages of Flex Seal Liquid.
Picture of product being rolled onto metal roof.
Brush Roll Dip Pour

Product guides and documents

Customer reviews

4.4 out of 5 stars
4.4 out of 5
1,798 global ratings

Customers say

Customers like the performance and ease of use of the sealant. For example, they mention it works awesome, is effective for both repairs, and is easy to apply. That said, some complain about the value. Opinions are mixed on leakage, durability, appearance, and adhesion.

AI-generated from the text of customer reviews

144 customers mention130 positive14 negative

Customers are satisfied with the performance of the sealant. For example, they mention it works awesome, is a great product, and is effective for both repairs. Some say that it comes in a spray can and works wonders in small places.

"Purchased this product for use on my travel trailer. It is awesome. It went on smooth with a roller and provided a nice leak free finish." Read more

"Very Good Product I Use It For The Wood Under My Front Door Very Thick I Would Buy It Again" Read more

"I want to make fun of buying this, but it works so well I just can’t." Read more

"Pricey product, but works very well, so makes it worth it!" Read more

43 customers mention32 positive11 negative

Customers like the ease of use of the sealant. They say it goes on easily, covers well, and small oops are easily wiped away. Some customers also mention that it's convenient and fast to use.

"Easy to use and did the job of plugging the leaks in our Amazon fountain." Read more

"...It was easy to apply but does take a while to dry fully (overnight)...." Read more

"...Upon opening the can for the first time I found a hard, crystalized, lumpy thick surface...." Read more

"...It went on easily,covered really well, and small "oops" we're easily wiped up with a cleaning cloth...." Read more

19 customers mention14 positive5 negative

Customers like the quality of the sealant. For example, they say it does a great job sealing cracks on the roof for leaks, it's okay sealer, and it makes a water tight seal. Some mention that it'll permeate the crack and seal easily. That said, most are happy with the product's quality and use it for small repairs.

"...It sealed up the crack and has been heat resistant as well." Read more

"Easy and fast to use. Repaired my birdbath easily." Read more

"...Not only did this product NOT work to seal the tiny holes in my newly refurbished gate (we were trying to create privacy by filling in the holes),..." Read more

"...It permeated the crack and sealed easily." Read more

57 customers mention37 positive20 negative

Customers are mixed about the leakage of the sealant. Some mention that it was easy to apply and they haven't had any leaks since, while others say that it worked great for fixing a leaking gutter and is a great liquid sealer for any small job. That said, some complain about the ridiculous dripping of the product and the fact that it didn't pour out freely as seen in the TV ad.

"After the 1st heavy rain, no leaks. We'll see when the next heavier rain hits this weekend." Read more

"Easy to use and did the job of plugging the leaks in our Amazon fountain." Read more

"...Instead, due to the ridiculous dripping of the product, we ended up using pretty much the entire can on the one side, and like i said only a..." Read more

"Great liquid sealer for any small job." Read more

33 customers mention15 positive18 negative

Customers are mixed about the durability of the sealant. Some mention it works great, is durable, and long-lasting, while others say that it began flaking off after a week, dried and cracked, and peeled off the sides in big sheets.

"...I feathered it out with a paintbrush. The product shrank as it dried (24 hours)...but I anticipated a second coat anyway...." Read more

"...Flex Seal was able to bond the cold patch together so it would not continually flake off...." Read more

"Goes on easy but for me, it began flaking off after a week. Not as satisfied with this as I've been w other products from this company" Read more

"...Dip but I used Flex Seal and I couldn’t be happier, it’s a durable non slip surface that allows me to have a constant good grip on whatever tool I..." Read more

15 customers mention5 positive10 negative

Customers are mixed about the adhesion of the sealant. Some mention that it adheres well, allowing them to have a constant good grip on whatever tool they need to use. However, others say that it failed to properly adhere to the PVC even after a 36 hour cure time, it is too thin to adhere properly to a vertical surface, and that it would slide easily.

"...solvents to try to clean the area as well as I could, but it didn't stick well enough to resist abrasion...." Read more

"...Put a cup in them with any liquid, and they are planted and un-moving. They won't slide off of a table without a lot of help...." Read more

"...So in short, it failed to properly adhere to the PVC even after a 36 hour cure time." Read more

"Doesn't adhere well to polypropylene (which, admittedly, is a very difficult material to bond to)...." Read more

15 customers mention8 positive7 negative

Customers are mixed about the appearance of the sealant. Some mention that it looks good once dry, while others say that it's not at all like the ads describe. They also mention that the product image is quite deceiving and the commercials are annoying.

"...It solved about 90% of the sweating problem and improved the look of the pipes. A couple of spots will need a second coat...." Read more

"The product image is quite deceiving, and I do not believe I'm the only one who was fooled (judging by the questions being asked), expecting a..." Read more

"...I took a couple pictures which don't do it justice. It dried really shiny, and looks wet although it's dry and looks and feels like rubber...." Read more

"...can for $15, and you might do better with the spray. The picture is misleading. If working on a medium to large project, the normal size large 48 oz...." Read more

32 customers mention8 positive24 negative

Customers are dissatisfied with the value of the sealant. They mention that it's a waste of money, not worth buying again, and expensive. Customers also say that it is messy and hard not to waste a little bit when applying it to something.

"...A bit pricey but worth it - goes a long way!" Read more

"...Works great. Took about a day, day and half to cure up right. It is a little pricey, but not by much. Worth it." Read more

"...This stuff worked ! Saved me hundreds on a replacement top. I also used it around the skylight on my motorhome - guess what ? no more leaks !!..." Read more

"...not worth buying again." Read more

Dipping a chain in Flex seal - worked great
5 Stars
Dipping a chain in Flex seal - worked great
2 new gates. I have 2 strong steel chains. But I wanted to protect the woid and metal of the metal gate and wood posts. I dipped in in it and I let it dry in an outdoor shed with lots of cardboard beneath it..Let first coat dry 2 days outside. Bring it inside and dry another day. REPEAT FOR A SECOND COAT..I strung a clothes line up to hold the chain vertical over some cardboard (it will drip a lot. Remove the chain very slowly from the can of Flex seal to let it drip excess in the can.
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Top reviews from the United States

Reviewed in the United States on May 29, 2023
Color: BlackPattern Name: RubberVerified Purchase
7 people found this helpful
Report
Reviewed in the United States on September 22, 2023
Color: BlackPattern Name: RubberVerified Purchase
Customer image
5.0 out of 5 stars Dipping a chain in Flex seal - worked great
Reviewed in the United States on September 22, 2023
2 new gates. I have 2 strong steel chains. But I wanted to protect the woid and metal of the metal gate and wood posts. I dipped in in it and I let it dry in an outdoor shed with lots of cardboard beneath it.
.
Let first coat dry 2 days outside. Bring it inside and dry another day. REPEAT FOR A SECOND COAT.
.
I strung a clothes line up to hold the chain vertical over some cardboard (it will drip a lot. Remove the chain very slowly from the can of Flex seal to let it drip excess in the can.
Images in this review
Customer image
Customer image
7 people found this helpful
Report
Reviewed in the United States on February 3, 2024
Color: BlackPattern Name: RubberVerified Purchase
Reviewed in the United States on March 16, 2024
Color: BlackPattern Name: RubberVerified Purchase
Reviewed in the United States on January 8, 2024
Color: BlackPattern Name: RubberVerified Purchase
Reviewed in the United States on October 3, 2023
Color: BlackPattern Name: RubberVerified Purchase
Customer image
3.0 out of 5 stars Product is solid but shipping sucked
Reviewed in the United States on October 3, 2023
As can be seen in the photo it looks like this box was thrown around and dropped several times. Flex seal is a great product but shipping made this go through a ringer
Images in this review
Customer image Customer image Customer image
Customer imageCustomer imageCustomer image
2 people found this helpful
Report
Reviewed in the United States on March 4, 2024
Color: BlackPattern Name: RubberVerified Purchase
Reviewed in the United States on October 27, 2023
Color: BlackPattern Name: RubberVerified Purchase
3 people found this helpful
Report

Top reviews from other countries

Manoj Swain
1.0 out of 5 stars Damaged can
Reviewed in India on July 23, 2020
Color: BlackPattern Name: RubberVerified Purchase
Customer image
Manoj Swain
1.0 out of 5 stars Damaged can
Reviewed in India on July 23, 2020
Received a crumbled can
Images in this review
Customer image
Customer image
george emmerson
5.0 out of 5 stars Liquid rubber
Reviewed in the United Kingdom on June 25, 2017
Color: BlackPattern Name: RubberVerified Purchase
William
5.0 out of 5 stars Flex Seal for sealing gutter leaks
Reviewed in Canada on July 5, 2018
Color: BlackPattern Name: RubberVerified Purchase
David John Nolan
5.0 out of 5 stars Five Stars
Reviewed in the United Kingdom on June 7, 2017
Color: BlackPattern Name: RubberVerified Purchase
BILL
4.0 out of 5 stars flex seal
Reviewed in Canada on September 16, 2018
Color: BlackPattern Name: RubberVerified Purchase