Flex Paste 1 Lb. Rubber Sealant, Black
$35.00
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- $123.69reg $142.24 Sale4.5 out of 5 stars with 383 ratings
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Guests are saying
Flex Paste is a versatile and effective solution for sealing leaks, cracks, and gaps across various surfaces. Guests appreciate its thick consistency, strong adhesion, and waterproof properties, making it ideal for both indoor and outdoor repairs. Many have found it easy to apply and quick to dry, ensuring lasting results. While some noted minor issues with packaging and application tools, the overall effectiveness and durability of the product have left a positive impression.
Summary created by AI from text of reviews reflecting recent feedback provided across different star ratings (includes incentivized reviews)
4.3 out of 5 stars with 743 reviews
5 out of 5 stars
9 September, 2026
originally posted on flexsealproducts.com
Easy to use and durable
[This review was collected as part of a promotion.] The durability of this product is great. Adhesion seems good and the consistency of the product makes it easy to work with. There's not a lot of mess when using this product and the black color of the paste makes it camouflage to black surfaces.
5 out of 5 stars
7 September, 2026
originally posted on flexsealproducts.com
Keeps moisture out
[This review was collected as part of a promotion.] This is rubberized paste that helps keeps moisture out. It’s a nice because it’s watertight it can be used with wood, glass tile so it has a variety of things it can be used with
5 out of 5 stars
5 September, 2026
originally posted on flexsealproducts.com
Gets the job done
[This review was collected as part of a promotion.] It took a while for me to use Flex Seal but I finally had the opportunity when my work sink had a pinhole leak. I grabbed the Flex Seal and VOILA no more leak. A three basin restaurant sink gets a lot of wear and tear! THANK YOU FLEX SEAL! Repaired in less than a couple of minutes.
5 out of 5 stars
4 September, 2026
originally posted on flexsealproducts.com
Just as good as Billy Mays said!
[This review was collected as part of a promotion.] Flex Seal is so good at keeping out water and air. We had a slight leak in our basement wall, and I dug it from the outside and sealed the crack all the way through and all the way around. It’s a fantastic product!
5 out of 5 stars
31 August, 2026
originally posted on flexsealproducts.com
Good sealant for your home!
[This review was collected as part of a promotion.] This stuff is so helpful as I renovate my old house. Part of my house is partially underground and some of the cinder blocks had gaps in them. I used the flex paste to fill those gaps and it created a strong thick seal! Highly recommend!
5 out of 5 stars
30 August, 2026
originally posted on flexsealproducts.com
Versatile for many surfaces
[This review was collected as part of a promotion.] This paste is great! It doesn’t run which is super helpful. There are so many surfaces you can use it for repairs. I will be ordered again I think next time I will get the clear paste as it’s more versatile and invisible! We’ve used it outside our home and inside of our home.
5 out of 5 stars
29 August, 2026
originally posted on flexsealproducts.com
Nice packaging
[This review was collected as part of a promotion.] I honestly could not find anywhere to test this out in my home. It is a very specific use case and we do not currently have any water leaks so I could not find anything to test it out on. 
5 out of 5 stars
24 August, 2026
originally posted on flexsealproducts.com
Works incredibly!
[This review was collected as part of a promotion.] This Flex Paste super thick rubber paste was incredible! I did not expect it to work as well as it did. It has great adhesion and has lasted for a long time so far!
5 out of 5 stars
23 August, 2026
originally posted on flexsealproducts.com
Several positive reviews
[This review was collected as part of a promotion.] As I am packing to move, I haven't yet used the product. All the videos ive watched so the smooth workability and that drying doesnt take a ton of time. Once we get settled into our new place if I find something to use the black paste on, I will update my review to be more accurately my opinion.
5 out of 5 stars
20 August, 2026
originally posted on flexsealproducts.com
Works as advertised
[This review was collected as part of a promotion.] Works as described. Easy to open and re-seal. I do worry about using it again and if it will still be as “fresh”. Helped prevent leaks around basement.
2 out of 5 stars
17 August, 2026
originally posted on flexsealproducts.com
I guess it works
[This review was collected as part of a promotion.] I didn’t really like this. Did it “fix” the hole in the hose? Yeah it did so there’s that but my flex paste come in the container so dry and I wasn’t even sure I was gonna be able to test it. I got the dry crunchy layer off and managed to try it on my leaking hose. The appearance isnt bad. It’s black rubber paste that covers well. The smell isnt something i enjoyed hit overall it did its job.
5 out of 5 stars
16 August, 2026
originally posted on flexsealproducts.com
Great stuff
[This review was collected as part of a promotion.] This stuff is amazing. I had some cracks that needed repaired outside and it worked amazing. Still holding up strong. Easy to apply. Goes on great.
5 out of 5 stars
15 August, 2026
originally posted on flexsealproducts.com
This paste works great
[This review was collected as part of a promotion.] This works amazing! I’ve used it on a couple of different materials and it bonds nicely. This is definitely a good thing to have in your toolbox. Works great for temporary fixes as well
3 out of 5 stars
14 August, 2026
originally posted on flexsealproducts.com
Super thick
[This review was collected as part of a promotion.] Flex Seal Black Flex Paste is definitely super thick as it says. I used it to fix a plant pot that literally broke in half. The paste itself is easy to use, and it seems to have dried very nicely, but i would rather have it in a tube of some sort. It's a good product for what it is used for.
5 out of 5 stars
14 August, 2026
originally posted on flexsealproducts.com
Perfect to strongly seal leaks or cracks
[This review was collected as part of a promotion.] I am not super handy, but there was a leak in one of the pipes in my basement where the PVC connected to another piece of PVC pipe. I added some of this product to the seal where the pipes were connected. I liked how this was black so I could see where I applied it to the pipes. It dried quickly and has prevented any water from leaking out of these pipes. I am looking forward to using this on my upcoming projects.
5 out of 5 stars
12 August, 2026
originally posted on flexsealproducts.com
Works well!
[This review was collected as part of a promotion.] This works wonders! We used a little to patch our roof, seal a small area near our back door and are looking for other things around the house to use it for too. It's a nice thick paste so it's very easy to apply intentionally without worrying it will run or drip and it's a flexible consistency as well. It doesn't have a strong odor which was nice! It dried as a very sturdy barrier so I'm sure our repairs will last a long time. Definitely a great item to have on hand.
5 out of 5 stars
12 August, 2026
originally posted on flexsealproducts.com
Easy to use
[This review was collected as part of a promotion.] I have only used this once to temporarily fix a water pipe. It was easy to use, dried fast and has been effective for over a week! Flex paste will be a standard in my home repair kit now!
5 out of 5 stars
12 August, 2026
originally posted on flexsealproducts.com
Super easy to use
[This review was collected as part of a promotion.] I love how easy this was to use! It took about a day to fully cure and was fully waterproof. It's super versatile and can be used anywhere, even under water.
5 out of 5 stars
12 August, 2026
originally posted on flexsealproducts.com
Pretty thick but creates a solid, waterproof coating.
[This review was collected as part of a promotion.] I’ve been using Flex Paste to waterproof some empty cardboard spools so I could repurpose them to organize my outdoor extension cords. Cardboard isn’t the best material for outdoor storage, so I wanted to add a protective barrier to help the spools hold up around moisture. The paste is very thick and worked well for this project because I could spread it over the cardboard and build up coverage where needed. The paste takes a while to cure, but once cured, it creates a solid, water-resistant coating and makes the spools feel much more durable.
5 out of 5 stars
11 August, 2026
originally posted on flexsealproducts.com
Amazing
[This review was collected as part of a promotion.] I absolutely love this black flex paste for quick patches on my driveway and garage seams! It keeps out bugs and rodents, seals up cracks and holes that cause erosion, and helps to increase the aesthetic presence of my DIY home repairs! Total win.