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
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This item is eligible for return within 30 days of receipt
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.
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Availability:
Only 4 left in stock, order soon!
Arrives
Monday, Jul 6
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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
Brand Name: Flex Paste
UPC: 850017897472
Unit Count: 192.0 Ounce
Number of Items: 1
Part Number: PFSMAXBLK01
Model: PFSMAXBLK01
Item Type Name: Flex Paste MAX Black Joint Compound 12 Lbs -Case of 1
Manufacturer: Swift Response, LLC
Included Components: Item
Warranty Description: 1 Year Limited
Water Resistance Level: Waterproof
Item Form: Paste
Compatible Material: Wood, Glass, Tile, Concrete, Aluminum, Metal, Brick, Stucco, Masonry, Copper, Fabric, Fiberglass, Ceramic, Porcelain, Natural Stones, Roofing, Pvc, Eifs, Cspe, Epdm, Hypalon Polyurethanes
Item Weight: 12 Pounds
Item Dimensions: 7.75 x 6.75 x 6.75 inches
Style Name: 12 lb Black
Color: Black
Surface Recommendation: Windows,Doors
Material Type: Rubber
Frequently asked questions
If you place your order now, the estimated arrival date for this product is:
Monday, Jul 6
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.
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Top Amazon Reviews
Color: Black
Size: Half-Quart
I had an outdoor water fountain that I forgot had water in it and it froze.... Which made the whole fixture crack at the water expanded. I use this flex paint to see if it would be able to seal the cracks and hold the water and it did!!! No more leaks and i the adhesion holds really really well. Drives fairly quickly like maybe 24 hours. The smell is a little strong so I would let it sit outside as it dries.
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Reviewed in the United States on December 13, 2025 by Frankie G Mongaras
Color: White
Size: Half-Quart
This is great as long as you know its a one use product for whatever your project may be. You can't seal the container up adequately enough to prevent it from drying out. I would encourage you to purchase multiple small packages rather than one large one if you have multiple projects or just resign yourself to a lot of product loss. I personally used it to coat the ends of peg style towel holders so towels would stop slipping off the slick ends and into the floor. Worked, and I didn't have to remove old hardware and purchase new ones. That's a win.
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Reviewed in the United States on June 17, 2026 by middleagediva
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.
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Reviewed in the United States on March 5, 2025 by Edward
Color: Black
Size: Half-Quart
Purchased this product, material was bone dry in the can, hard as a rock… I did a return, same thing, hard as a rock bone drive. Both of the cans were completely sealed and had no dents on the top so it doesn't look like they had been resealed so I'm guessing this is a problem, maybe with the Black? Which is what I use. Anyway, whoever, however, whatever, this is pretty crappy
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Reviewed in the United States on March 31, 2026 by kg
Color: Black
Size: Half-Quart
I used this to patch together two pieces of EPDM pond lining. 3 months later it's working beautifully. I also used it to create a 4 inch high stone "wall" for the waterfall to spill over. That also worked very nicely. It does apply well under water [I tested that] but I initially applied it on completely dry lining and dry stones. Left it alone for 3 days just to be sure it cured and there was no disappointment. The only problem was the packaging. I used 2 containers and each was only half useable. The middle of the paste was pliable but somehow the outer rims of paste were too hardened to use. Basically, between the 2 containers, I was only able to use what amounted to 1 container. Other than that, I'll be using this paste again. It's very strong, really seals, and lives up to all the claims.
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Reviewed in the United States on October 4, 2024 by Christine
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.
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Reviewed in the United States on March 16, 2024 by Fezno Mint
Color: Black
Size: Half-Quart
We have a large deck storage box for outdoor seat cushions, and squirrels soon used the edges of the box lid to sharpen their teeth; thus, destroying the waterproofing of the box. First, I had to get rid of the squirrels, and I finally adopted some outdoor cats to make the squirrels move to the treetops, where the little rodents sharpen their teeth on tree branches instead of on my deck box and outdoor furniture. Second, I had to repair an expensive deck box, and the answer was Flex Paste, which I applied with a putty knife. It was easy to apply and shape--initially to seal the gaps and form a rounded corner, and later to fill the right angle edge that I formed with the corner of a cardboard box. I was not looking for beauty; instead I went for utility. After all, it's just a deck storage box. I wore disposable rubber gloves during the project, and I used paper towels and 90 percent rubbing alcohol to clean my putty knife and pocket knife afterwards. I finished the job yesterday and a heavy thunderstorm rolled in today. I just checked the repaired box, and our seat cushions are perfectly dry. Mission accomplished!
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Reviewed in the United States on September 24, 2025 Reviewed in the United States on September 24, 2025 by The General
Color: White
Size: MAX
This is an a-m-a-z-i-n-g product!!! I stumbled on a small can of it in a hardware store. It works so well, that I purchased a gallon. I am using it on the roof of my motor coach and a box trailer.
Reviewed in the United States on February 20, 2026 by Bonita Richey