Can this be used on flexible surfaces?

Depends on how flexible. It has to be able to adhere to the surface. It cures the same as rubber in a tire. There is some give.

Hello there. That's an excellent question. Flex Paste can be applied to dry or wet surfaces and even underwater. It does not dissolve, creating a watertight seal. Thank you very much for reaching out to us with your question. Please write to us anytime. We're always happy to help. Flex On!

Flex seal pasta can it be used on curved surfaces?

Yes it can be used on any curved and even upside down surface but if ordering on-line, if you open the can and the edges are turning hard return it ASAP because chances is it's hard on bottom as-well and you don't get your money worth

Can I use in a in ground swimming pool to repair a crack

Yes, it can be applied underwater. It won’t dissolve or wash away. It even dries underwater! Flex Paste is easy to use. With a putty knife, trowel, spatula, roller, or stiff brush remove a smooth even layer of material from the top of the tub. Scooping deeply into the tub may cause air pockets which can dry FLEX PASTE. Apply a generous amount using a smooth sweeping motion.

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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, Half-Quart

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, Half-Quart

Product ID: 368440065

Details

Brand
Flex Paste
Item Weight
1 Pounds
Item dimensions L x W x H
10.8 x 10.8 x
Material
Resin
Style
Compact

🌊Dries underwater

🖌️Fully paintable finish

🛡️Waterproof & UV resistant seal

€ 74.84

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Description

🛠️ Seal it, paint it, forget it — Flex Paste has your repairs covered!

PAINT IT YOUR WAY - Once cured, seamlessly paint over to match any surface and prevent rust or corrosion.
WORKS EVEN UNDERWATER - Apply confidently underwater—dries to a strong, durable seal without compromise.
SUPER THICK SUPER STRONG - Instantly fills large gaps, cracks, and holes with a clingy, resilient paste that won’t shrink or crack.
ULTIMATE WATERPROOF DEFENSE - Creates a flexible, rubberized barrier that blocks air, water, and moisture for lasting protection.
STAY FRESH CONTAINER INNOVATION - Air-tight packaging locks in freshness and sealing power, eliminating waste and ensuring peak performance.

Flex Paste is a versatile, waterproof, and UV-resistant paintable putty designed to fill and seal gaps, cracks, and holes on a variety of surfaces including walls, drywall, concrete, roofs, and RVs. Its unique formula works underwater and cures into a flexible, durable rubberized barrier. Packaged in an innovative stay-fresh container, it ensures long-lasting sealing power with zero waste, making it the go-to solution for professional-grade repairs and DIY projects alike.

Specifications

ASIN	B084TDS8S5
Best Sellers Rank	#9,866 in Industrial & Scientific ( See Top 100 in Industrial & Scientific ) #51 in Hardware Sealers
Brand	Flex Paste
Brand Name	Flex Paste
Colour	Black
Compatible Material	Diy
Country of Publication	USA
Customer Reviews	3.8 out of 5 stars 3,135 Reviews
Included Components	Household Item
Item Dimensions	10.8 x 10.8 x 6.4 Centimeters
Item Form	Paste
Item Type Name	Flex Paste 1 lb Jar (Black)
Item Weight	454 g
Item dimensions L x W x H	10.8 x 10.8 x 6.4 Centimeters
Manufacturer	Swift Response, LLC
Manufacturer Part Number	PFSBLKR16
Material	Resin
Material Type	Resin
Model	FLEX SEAL - PFSBLKR16 - BLACK
Number of Items	1
Style	Compact
Style Name	Compact
Supported Standards	ASTM C-920
Surface Recommendation	Windows,Doors
UPC	850010226804
Unit Count	473.18 Milliliters
Water Resistance Level	Waterproof

Reviews

R**U

Good product

Very good sealing properties worked well on steel roof.

12.06.2026

F**T

loved it

fixed the problem we had

3.02.2026

F**S

Perfect water sealant with no leaks on cracked items

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.

13.12.2025

G**S

Excelente !!

Excelente producto, hace todo lo que promete. Solo lo puedes usar una vez, lo deje muy bien tapado como venía en el instructivo y se seco, pero cumple perfectamente su función.

4.11.2022

関**雄

半分は固まり

トップライトの雨漏りに、ガラス周りをこのペーストでシーリングしました。効果は高いけど購入の半分は固まりで使えない

14.05.2025

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Yes, all products are sourced directly from authorized retailers in the US, UK, UAE and India. We maintain strict quality control processes and verify each product before shipping. All items come with applicable manufacturer warranties and are covered by our standard return policy.

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TrustScore 4.5 | 7,300+ reviews

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Smooth transaction and product arrived in perfect condition.

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€ 74.84

Duties & taxes included

In stock

Sold byAmazon PortugalDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

Buyer Protection · Full refund if your order doesn't arrive as described.

Desertcart purchases this item on your behalf and handles shipping, customs, and support to Portugal.

Secure transaction

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Fast, free shipping, member pricing & priority support.

Join PRO →

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TrustScore 4.5 | 7,300+ reviews

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I loved the variety of products available. Will definitely shop again.

2 months ago

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