Flex Paste, Waterproof Paintable Putty, Spackle Sealant, Fill Gaps Cracks Holes - Block Out Water and Air - UV Resistant - Walls, Drywall, EPDM, Concrete, Roof, RV Repairs, Black, MAX
Condition: New
Buy Now, Pay Later
As low as
$18.17
/ mo
Learn more
- – 6-month term
- – No impact on credit
- – Instant approval decision
- – Secure and straightforward checkout
Ready to go? Add this product to your cart and select a plan during checkout.
Payment plans are offered through our trusted finance partners Klarna, PayTomorrow, Affirm, Afterpay, Apple Pay, and PayPal. No-credit-needed leasing options through Acima may also be available at checkout.
Learn more about financing & leasing here.
Selected Option
Free shipping on this product
30-day returns
Learn more
30-day refund/replacement
To qualify for a full refund, items must be returned in their original, unused condition. If an item is returned in a used, damaged, or materially different state, you may be granted a partial refund.
To initiate a return, please visit our Returns Center.
View our full returns policy here.
Availability:
In Stock.
Arrives
Friday, Sep 12
Recently Viewed
![TAURI for iPhone 15 Plus Case, [5 in 1] 1X Green Case [Not-Yellowing] with 2X Tempered Glass Screen Protector + 2X Camera Lens Protector, [Militarized Drop Defense] Slim Phone Case 6.7 inch, Green](https://m.media-amazon.com/images/I/71bi6xujHpL._AC_US500_.jpg)
Color: Black
Size: MAX
Features
- NEW! STAY FRESH CONTAINER Blocks out air and locks in freshness to extend the sealing power of Flex Paste, with no waste
- COAT, SEAL & PROTECT - Penetrates deep to seal out air, water, and moisture. Once dry, it turns into a strong, flexible, watertight, rubberized barrier
- WORKS UNDERWATER - Can be applied underwater, and it even dries underwater
- FILLS LARGE AREAS - Super thick rubber paste clings to the surface and instantly fills large gaps, cracks, and holes
- FULLY PAINTABLE - Once fully cured, it can be painted any color. Helps prevent rust and corrosion, and it is UV resistant
- EXCELLENT FOR filling cracks and holes, foundation and concrete repairs, bath and shower, indoor and outdoor projects, roof, RV, motorhome, auto, marine, lawn and garden projects, DIY, hobbies, and more
- MADE IN THE USA
Material: Rubber
Brand: Flex Paste
Style: 12 lb Black
Item Weight: 12 Pounds
Item dimensions L x W x H: 7.75 x 6.75 x 6.75 inches
Product Dimensions : 7.75 x 6.75 x 6.75 inches; 12 Pounds
Item model number : PFSMAXBLK01
Department : Unisex-Adult
Date First Available : August 11, 2021
Manufacturer : Swift Response, LLC
Best Sellers Rank: #2,546 in Tools & Home Improvement (See Top 100 in Tools & Home Improvement) #9 in Hardware Sealers
#9 in Hardware Sealers:
Customer Reviews: 3.9 3.9 out of 5 stars 5,808 ratings
Frequently asked questions
If you place your order now, the estimated arrival date for this product is:
Friday, Sep 12
Yes, absolutely! You may return this product for a full refund within 30 days of receiving it.
To initiate a return, please visit our Returns Center.
View our full returns policy here.
To initiate a return, please visit our Returns Center.
View our full returns policy here.
- Klarna Financing
- Affirm Pay in 4
- Affirm Financing
- Afterpay Financing
- PayTomorrow Financing
- Financing through Apple Pay
Learn more about financing & leasing here.
Similar Products
Top Amazon Reviews
Color: Clear
Size: Half-Quart
I was honestly skeptical about Flex Seal Paste at first. I had a decent-sized hole in the side of my pool while it was still full of water, and I didn’t really expect anything to fix that without draining it. But I gave this a shot—and to my surprise, it sealed the hole tight! It went on thick, stuck well even underwater, and didn’t peel off or loosen. It’s been holding strong for weeks now. I wasn’t sure it would work in that kind of situation, but it definitely proved me wrong. If you’re on the fence like I was, it’s worth trying. and don’t doubt its looks trust in yourself
...
show more
Reviewed in the United States on July 22, 2025 by Enrique V
Color: Clear
Size: Half-Quart
What a great product. I have a small retaining wall that holds back sand. After a rain it shifted a bit. I repaired it and then sealed it with this flex seal paste. Perfect!
Reviewed in the United States on July 27, 2025 by Yvonne B.
Color: White
Size: Half-Quart
I ordered 3 of the metal cans after reading reviews about the plastic containers arriving sealed but with the contents already cured solid anyway. I was sent 1 metal and 2 plastic containers, so not what I was led to believe I was buying and sure enough the first one I opened was rock solid. Could barely stick a knife halfway in it. I returned all 3 because I wasn't going to risk not getting refunded. This stuff is too expensive to just say oh well and throw away.
...
show more
Reviewed in the United States on June 9, 2025 by Shadow Foxx
Color: Black
Size: Half-Quart
Product worked very well. Good amount of workable time, spreads well with a small spackling knife. The only complaint is that the product arrived with the top 1/8" dried up and unusable, and since you don't get that much in the can, having to throw away about 2 spoons full is a real problem. They need to seal the can lid better.
...
show more
Reviewed in the United States on March 5, 2025 by Edward
Color: Black
Size: MAX
Used it to fill in around, and cover; previously tar-filled expansion joints on a concrete driveway. It went on relatively smoothly until exposure to air began setting the contents while working with it and it became relatively lumpy and difficult to continue applying. I may brush the liquid over the paste later in a concerted effort to smooth the application? I may also try to smooth it with a wire wheel on my Ryobi string trimmer?
...
show more
Reviewed in the United States on June 13, 2025 by HiDolPmPpp
Color: White
Size: Quart
Amazon's web page shows the "NEW! Stay Fresh Container", but they shipped the old obsolete plastic tub. As many of the other reviewers have correctly stated, the plastic tub cannot keep the product soft, pliable and usable. I called the FlexSeal factory, and they are fully aware of the problem. If you order from the FlexSeal website, the factory is shipping the Stay Fresh can as of 2024, March 12. This is a good product, but it's a complete waste of money to buy it in the obsolete plastic tub. That form of packaging is incapable of keeping the product in usable form. It hardens from the top down. I bought two from local stores, and learned that if you squeeze the tub at the top and it doesn't feel soft, the product has hardened and won't be usable. Typically it will be softer near the bottom, but all of the product above (the unsqueezable part) is so hard you can't get it onto the putty knife. Amazon needs to stop shipping the product in the obsolete plastic tub. Update: I called Amazon Customer Service and advised them that the plastic tub packaging is obsolete and no longer being shipped by the factory, and that they should return all product in the plastic tubs, and ship only the product (in the can) shown on the web page. I was advised that they would do so. That was on March 16, the same day I ordered the new (can) packaging directly from the factory. It arrives today (March 20). Shipping was free. Looking forward to seeing how it performs in patching a stucco parapet wall. Update: I received the can from the factory. The product was fresh and easy to apply. Because I was applying it on stucco, it took more to fill all the nooks and crannies than I expected, so I will need another can to finish the job. I ended up doing the whole job with a putty knife. I applied it in full sunlight on a warm breezy day, but it stayed flexible enough to work it into a smooth surface as I went. I doubt it will need a second coat. I don't know how long it will last, but I expect it will be pretty durable. There is no way any rain is going to get through the FlexPaste. I used a rubber spatula to scrape all the product from the sides and bottom of the can. Clean-up was easy; I just wiped the material off the tools with paper towels.
...
show more
Reviewed in the United States on March 16, 2024 by Fezno Mint
Color: White
Size: Half-Quart
Why did you pick this product vs others?: I had a couple of small leaks in my basement where the block wall meets the floor. Not a lot of water but just a trickle when there were heavy rains. I applied it to the trouble areas and since then no leaks at all. Very happy!
Reviewed in the United States on July 7, 2025 by Pam Hoyt
Color: White
Size: Half-Quart
I like flex seal. It just doesn't have a real long shelf life and should only be purchased when you know you are going to need to use it.
Reviewed in the United States on July 22, 2025 by Dean Anthony