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Your cart is empty.Product Description
NEW! Stay Fresh Container.
Blocks out air and locks in freshness to extend the sealing power of Flex Paste, with no waste.
Coats, seals, and protects.
Penetrates deep to seal out air, water, and moisture. Once dry, it turns into a strong, flexible, watertight, rubberized barrier.
Use it virtually everywhere.
Make foundation and concrete repairs, block water from entering doors, and windows, and more.
Works indoors and outdoors.
Flex Paste is waterproof and weatherproof, as well as chemical and UV resistant. Plus, it’s fully paintable.
Clings to wet and dry surfaces… even underwater.
No need to wait for surfaces to completely dry before sealing them. It even cures underwater.
Never shrinks or cracks.
Flex Paste stays completely flexible, making it perfect for all-season roof repairs and all types of DIY projects.
Can be spread, shaped, and formed.
This thick rubberized paste is exceptional for all types of crafts, hobbies, and more.
Made in the USA
Flex Paste is proudly made in America, using globally sourced products.
Seann
2025-08-29 10:23:20
Works well. It's held up for over a year now.
Donna Duhe
2025-08-18 11:24:04
Unfortunately, upon opening the plastic container, only half was usable as the outer sides of the container were hard and unusable. So, As much as I Love this product,, because of the price, and I only could use half of my purchase , I will not buy again.
Jay
2025-07-26 16:26:24
If you believe in leprechauns, then you'll believe Flex Paste works on wet surfaces. But let's be real—leprechauns aren't sealing your roof leaks. Despite its mythical claims about underwater usage, this stuff is fantastic for sealing large gaps and cracks (on dry land).I used Flex Paste as a pond liner seam seal after properly prepping, cleaning, and drying the area. Once it was ready, this magical black goo did an incredible job! No more leaks, and my pond is now a happy home for my fishy friends. Just don't try to use it underwater unless you're looking to meet some imaginary creatures.For dry surface fixes, Flex Paste is your go-to hero! For wet surfaces, stick to fairy tales.
Carroll S
2025-07-02 16:40:54
UPDATE - I have been monitoring the pipe for the last few days. While I initially thought the paste was going to provide the fix I needed, that "thought" would be incorrect. The water started leaking again. Be smart/save your money and do not buy this stuff. I'm going back to what I should have done to start with - turn off the water and replace the pipe. This Flex Paste is JUNK!!!!Had a very small leak at the base of this water faucet (small droplets of water on the PVC surface). Based on the advertisement I thought the paste would be the perfect fix. I followed the directions as stated on the container. After apply a good initial coat, I still had the small leak. The next day, I applied another coat - still had the leak. The next day, after turning off the water to everything, I applied another coat heavy/massive amount of paste using both a putty knife and my hand. Left the water off for 1 to 2 hours and the leak appears to have stopped (after using most of the paste). What a pain!!!While using the paste, I was diligent in keeping the lid on the paste. At the end of each day, I would use a rubber mallet to hammer the lid on. Regardless of the tight seal, the paste still hardened.Probably would have been easier to just replace the bad piece of PVC that was leaking.
CaptJ
2025-06-28 19:09:04
I have used Flex Seal paste in household projects over the past few years and had extreme success. Over the past month I removed cleaned and reseated 14 Portlights, and 4 Deck hatches on my sailboat. I have full confidence that this will last long into the future. The price was a 50% of the previous 3m products I have used in the past. It may be over kill but I used 12 tubes for my project. I used the RYOBI battery powered caulking gun, which made it very easy and controllable. I then used my fingertip (rubber gloves) for smoothing. I continually sprayed my gloved fingertip with alcohol and smoothed to a perfect finish.NOTE: I took the above pictures before trimming and smoothing the Flex Paste.
Albacore Shuffle
2025-05-21 19:23:15
I'd have returned this product if time had allowed.The top 1" was rock hard and completely dried out.I had to break through the top layer to get to usable product.It did stop the leak.I'd have given 5 stars if 1/4 of the product wasn't dried out.
dowghouse
2025-05-10 17:01:09
i had a shower pan that was cracked when i bought the product 9 years ago. i had a little water always in one corner where the floor rotten out years ago. i used the tape and paste, then and now and it is drying and i will use the spray can of almond and it will be good to go until i can afford to tear it all out, but this product is so good. im not in any hurry to spend 500 plus dollars yet...15 saves me 500 for now...
Richard H. Reeves
2025-04-23 21:48:19
I have used flex paste in to repair cracks and seal my fireplace flashing, I even painted over a sneaker cabinet covered with wall paper with clear flex seal, looks awesome.Just completed repairs to the plywood on my patio ceiling to restore badly weathered soffit material. Photos show the results. It was a little extra work getting it smooth but worth the effort because I wanted to eliminate have to sand overhead after using conventional fillers.All the flex seal products have worked well for me, even in some whys that you’ll never see in there commercials.
James R Anderson
2025-04-08 16:42:12
excellemt product
Teresa Galena
2025-03-23 15:59:15
Easy to use works great
Don Chapman
2025-03-20 12:13:25
It came to me dry and had to thin it out .
Lea
2025-03-14 10:48:03
Lo pedimos hace 11 meses y lo abrimos ayer. ¡Fue difÃcil! No pudimos usarlo. Veo muchas reseñas que dicen lo mismo.
Gustavo M Ripol Bermudez
2025-02-15 18:23:12
TenÃa un tema con un domo cuyo sello ya estaba completamente temporizado. Lo arrglé con esta pasta, muy rápido y efectivo
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