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

4.5 4.5 out of 5 stars 2,680 ratings
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Purchase options and add-ons

Material Rubber
Brand Flex Seal Liquid
Style Protective
Item Weight 16 Ounces
Item dimensions L x W x H 3.38 x 3.38 x 4 inches

About this item

  • Flex Seal Liquid is liquid rubber in a can! Now you can brush, roll, dip or pour it on!
  • Use anywhere you need a watertight, flexible rubberized coating
  • Goes on smooth and covers fast, sealing out water, air and moisture
  • UV Resistant
  • Prevents rust and corrosion. Chemical resistant

Additional Details

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This item: Flex Seal Liquid, 16 oz, Clear, 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

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Flex Seal Liquid, 16 oz, Clear, 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, 16 oz, Clear, Liquid Rubber Coating Sealant, Waterproof, Flexible, Breathable, and UV Resistant, Roof Repair, Basements, RV, Campers, Trailers, Marine, EPDM, Masonry
Flex Seal Liquid , 16 oz, Clear, Liquid Rubber Coating Sealant, Waterproof, Flexible, Breathable, and UV Resistant, Roof Repair, Basements, RV, Campers, Trailers, Marine, EPDM, Masonry
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Price$17.99$249.99-6% $32.77
List:$34.99
$20.67-7% $22.43
Typical:$24.07
$109.98
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Important information

Ingredients

Contains: Butan-2-One 0, 0', 0'-(Methylsilylidyne) Trioxime, Aminopropyltriethoxysilane, VOC Content: Sealant or Caulking Compound 55 g/L (0.46 Lb/Gal).

Customer reviews

4.5 out of 5 stars
2,680 global ratings

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Customers say

Customers find the sealant easy to apply and effective at sealing. It works well with mold release, providing good coverage and sealing cracks. It is waterproof. However, some customers have mixed opinions on leak prevention, value for money, drying time, and Flex Seal.

AI-generated from the text of customer reviews

181 customers mention "Works well"159 positive22 negative

Customers like the sealant. They say it works well, is easy to work with, and has no negative issues. It works well with mold release if applied in layers and then a plaster mother mold. Overall, customers are satisfied with the product's performance and its ability to withstand movement or flex without failing.

"...I used it to patch a leak in my RV roof and it worked like a charm. It's super easy to apply, dries quickly, and is incredibly strong...." Read more

"worked perfectly." Read more

"It works pretty good but I had to apply three coats of it to make it leakproof" Read more

"...It works perfectly. I did need to buy 2 cans because I put 2 coats on the rug. It is very thick when you paint it on." Read more

37 customers mention "Ease of application"28 positive9 negative

Customers find the sealant easy to apply. It goes on smoothly like thick paint, and it covers an accurate 18.75 square feet.

"...It's super easy to apply, dries quickly, and is incredibly strong. I'm impressed with how well it adheres and how flexible it remains...." Read more

"This is the second time I have purchased. Easy to use coverage is exact 18.75 square ft. I painted decking boards 60"x 5.5" will cover total of "8"...." Read more

"...I used it to cover the entire wall. Went on easy, like a thick paint. Did take a couple days to completely dry. Dries very glossy...." Read more

"It was much more thin and runny than I was hoping for so it was hard working with it. If it was a gel it would have been perfect...." Read more

32 customers mention "Sealability"32 positive0 negative

Customers are satisfied with the sealant's performance. They mention it works well, is clear, and dries quickly. It seals cracks, seams, and ceiling joints. The sealant is easy to use and dries faster than expected.

"Flex Seal is great for sealing bird baths. It makes it so much easier to clean them." Read more

"...By the way, my project was a success. Sealed the 8" crack perfectly! My antique birdbath is fully operational!" Read more

"...recycling the water from the basin, for a week now, and the seal seems tight. I'm very pleased. I hope it lasts longer that the other product!" Read more

"...n't ever buy from TV ads, but a neighbor and my son said it was a great sealant. Reviews indicated it may be hard to work with...." Read more

26 customers mention "Waterproof"19 positive7 negative

Customers appreciate the waterproof sealant. It prevents water from seeping in and beads up on surfaces, making them weatherproof. They mention it works well for keeping out water, stopping leaks, and weatherproofing outdoor furniture. However, some customers note that the product does not work as advertised unless the surface is completely dry.

"Fun fact: you can use this stuff to weather proof outdoor furniture. I used it to weatherproof a pool table. It goes on smooth and stays shiny...." Read more

"...It does provide a waterproof coating." Read more

"...The cover still keeps the water hot, but is no longer waterproof so when it rains it fills the tub. SO, I bought this to fix the cover...." Read more

"...with Flex Seal clear, gave it a day to dry and the water feature was working again...." Read more

76 customers mention "Leak prevention"49 positive27 negative

Customers have mixed opinions about the sealant's leak prevention. Some say it stops leaks, protects surfaces, and seals cracks on concrete porches and driveways effectively. Others mention it doesn't stop leaks, makes the area around it look terrible, and rubbed off or chipped.

"...from fixing a roof leak, rain gutter repair, sealing cracks on my concrete porch and driveway, and sealing around the balcony doors...." Read more

"...No more water leaking" Read more

"I managed to use mine twice before the lid no longer sealed sufficiently enough to prevent 90% of the product to be wasted as a dry messy gooey mess." Read more

"...My shower pan was leaking and this product sealed the minor cracks and stopped the leake. It saved me a costly repair" Read more

51 customers mention "Value for money"25 positive26 negative

Customers have mixed opinions about the sealant's value for money. Some find it an excellent product for the price and good for waterproofing metal, while others say it's not worth the high cost over other, better-made sealants. They mention it provides limited square foot coverage for the money, isn't easy to work with, and was a waste of money.

"...Not good. It was an expensive mistake. Len" Read more

"...Time and money a huge money saver! Hope this helps." Read more

"...think of a lot of uses for this product, too bad it's rather expensive for the volume...." Read more

"...Although Flex Seal is not inexpensive, it was more so than the other sealer I had used...." Read more

33 customers mention "Dries quickly"20 positive13 negative

Customers have mixed opinions about the sealant's drying time. Some mention it dries crystal clear and transparent, leaving the floor perfectly dry even after heavy rain. Others say it takes forever to dry, starts drying up immediately after opening, and has a runny texture when dried.

"...It's super easy to apply, dries quickly, and is incredibly strong. I'm impressed with how well it adheres and how flexible it remains...." Read more

"...If it was a gel it would have been perfect. Took forever to dry too. I'll try it on other projects but I'm not thrilled so far." Read more

"...Did take a couple days to completely dry. Dries very glossy. Would have preferred a mat finish but still looks fine. Dried clear. Recommend." Read more

"...more leaks, and you can't even tell that there is sealant because it's clear. I love this product." Read more

23 customers mention "Flex seal"8 positive15 negative

Customers have different experiences with the flex seal. Some say it peels off easily, while others mention it tears apart under stress and crumbles over time. They also mention that the can hardens in transit and the packaging was damaged.

"...It ruined the pump and caused hairline cracks in the bowl of the fountain. I was able to order a new pump from Lamps Plus (love them)...." Read more

"...WRONG! Flex Seal did the job amazingly! Totally recommend!!!" Read more

"...It will tear apart under stress whereas silicone caulk will stretch to the moon before tearing. I have experimented with this for rubber molds...." Read more

"...it will crumble from that spot over time. it has good grip though. wish there was a more clear one. this one is too milky." Read more

Great Product! Great Value! Product performs as advertised!
5 out of 5 stars
Great Product! Great Value! Product performs as advertised!
This is the second time I have purchased. Easy to use coverage is exact 18.75 square ft. I painted decking boards 60"x 5.5" will cover total of "8". I recommend using a brush that can be thrown away. I used a 2" all purpose polyester brush $2.99. Depending on how long project takes you might need a spare brush the paint does stiffen quickly. Cannot leave brush to come back later. Do project within an hour. If not brush will not be flexible or pliable. ( have a spare brush). I have cleaned a brush but it was very difficult to get all of the the product out of brush. The foam disposable brushes DO NOT WORK WELL! To do one quarter of a board resulted in using 2 foam brushes leaving a third heavy and crumbled. The foam becomes heavy and comes off the stick. Creating a huge mess. I have also used a small portion of can and if you make sure rim is clean clear of paint and put lid on with a hammer to assure it is closed I have gone back 6 months later and paint was useable not hard no problems ease of use as if just purchased. I've used before I actually used wrong wood and after 4 months the previous wood that I painted was great no mold no rotting. The product held up well exactly as advertised. I have applied and temp dropped to 45 degrees no problem. The picture shows proper wood. Painting front and back to avoid replacing wood again. The value of not having to replace wood especially when it will be touching ground on my ramp. Time and money a huge money saver! Hope this helps.
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Top reviews from the United States

  • Reviewed in the United States on December 28, 2024
    This Flex Seal stuff is the real deal! I used it to patch a leak in my RV roof and it worked like a charm. It's super easy to apply, dries quickly, and is incredibly strong. I'm impressed with how well it adheres and how flexible it remains. Definitely a must-have for any DIYer.
  • Reviewed in the United States on July 20, 2024
    FlexSeal products are the best in their class. I've used it in various places around the house from fixing a roof leak, rain gutter repair, sealing cracks on my concrete porch and driveway, and sealing around the balcony doors. This stuff is amazing. FlexSeal stands behind its products; if you need to work with customer service, you will be impressed. Ashanti went above and beyond in helping me with a color match issue and I will be a lifelong customer!
    5 people found this helpful
    Report
  • Reviewed in the United States on November 11, 2024
    worked perfectly.
  • Reviewed in the United States on July 17, 2024
    It works pretty good but I had to apply three coats of it to make it leakproof
    One person found this helpful
    Report
  • Reviewed in the United States on November 15, 2024
    I used this to seal the inside of a beautiful vase I wanted to use for flowers. No more water leaking
  • Reviewed in the United States on July 4, 2024
    I used many layers of Flex Seal on my shower floor and it turned opaque and looked awful. If you use
    this for waterproofing, don't use it over and over many layers, or it will look weird. I had a mess.
    Make sure to use it on a FLAT shower floor that is pivoted on an angle towards the outtake drain.
    Never use Flex Seal on a bumpy flat shower floor!! The thicker you pour it, the heavier is settles in
    the ditches of the bumpy floor and the fuzzier it will look. Not good. It was an expensive mistake. Len
    4 people found this helpful
    Report
  • Reviewed in the United States on September 12, 2024
    Flex Seal is great for sealing bird baths. It makes it so much easier to clean them.
  • Reviewed in the United States on November 18, 2019
    This is the second time I have purchased. Easy to use coverage is exact 18.75 square ft. I painted decking boards 60"x 5.5" will cover total of "8". I recommend using a brush that can be thrown away. I used a 2" all purpose polyester brush $2.99. Depending on how long project takes you might need a spare brush the paint does stiffen quickly. Cannot leave brush to come back later. Do project within an hour. If not brush will not be flexible or pliable. ( have a spare brush). I have cleaned a brush but it was very difficult to get all of the the product out of brush. The foam disposable brushes DO NOT WORK WELL! To do one quarter of a board resulted in using 2 foam brushes leaving a third heavy and crumbled. The foam becomes heavy and comes off the stick. Creating a huge mess. I have also used a small portion of can and if you make sure rim is clean clear of paint and put lid on with a hammer to assure it is closed I have gone back 6 months later and paint was useable not hard no problems ease of use as if just purchased. I've used before I actually used wrong wood and after 4 months the previous wood that I painted was great no mold no rotting. The product held up well exactly as advertised. I have applied and temp dropped to 45 degrees no problem. The picture shows proper wood. Painting front and back to avoid replacing wood again. The value of not having to replace wood especially when it will be touching ground on my ramp. Time and money a huge money saver! Hope this helps.
    Customer image
    5.0 out of 5 stars Great Product! Great Value! Product performs as advertised!
    Reviewed in the United States on November 18, 2019
    This is the second time I have purchased. Easy to use coverage is exact 18.75 square ft. I painted decking boards 60"x 5.5" will cover total of "8". I recommend using a brush that can be thrown away. I used a 2" all purpose polyester brush $2.99. Depending on how long project takes you might need a spare brush the paint does stiffen quickly. Cannot leave brush to come back later. Do project within an hour. If not brush will not be flexible or pliable. ( have a spare brush). I have cleaned a brush but it was very difficult to get all of the the product out of brush. The foam disposable brushes DO NOT WORK WELL! To do one quarter of a board resulted in using 2 foam brushes leaving a third heavy and crumbled. The foam becomes heavy and comes off the stick. Creating a huge mess. I have also used a small portion of can and if you make sure rim is clean clear of paint and put lid on with a hammer to assure it is closed I have gone back 6 months later and paint was useable not hard no problems ease of use as if just purchased. I've used before I actually used wrong wood and after 4 months the previous wood that I painted was great no mold no rotting. The product held up well exactly as advertised. I have applied and temp dropped to 45 degrees no problem. The picture shows proper wood. Painting front and back to avoid replacing wood again. The value of not having to replace wood especially when it will be touching ground on my ramp. Time and money a huge money saver! Hope this helps.
    Images in this review
    Customer image
    Customer image
    46 people found this helpful
    Report

Top reviews from other countries

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  • Amazon Customer
    3.0 out of 5 stars Flex
    Reviewed in Brazil on November 14, 2024
    Atendeu minhas expectativas.
  • BADER
    5.0 out of 5 stars العزل ممتاز جدا
    Reviewed in Saudi Arabia on June 9, 2024
    ممتاز وجودة عالية
    عزل قوي مثل ماذكر في الاعلان
  • owen welsh
    5.0 out of 5 stars no leaks very happy.
    Reviewed in Canada on December 4, 2017
    The glue on my grey water drain dried up and crumbled away over the years.I did the entire inside of the floor drain with the flex seal and waited 30 hrs to run dishwasher,wsher etc.no leaks very happy.
  • Arthur Dalmolin Dahmer
    3.0 out of 5 stars Bom, porém a entrega é ruim
    Reviewed in Brazil on December 15, 2022
    O produto é bom, mas a entrega deu problema (disseram que tinha sido entregue, mas só chegou 3 dias depois; a caixa veio amassada; o produto apresentava um pequeno vazamento)
  • Sabrina B.
    5.0 out of 5 stars Five Stars
    Reviewed in Canada on June 13, 2017
    commande arrivée avant terme!
    One person found this helpful
    Report