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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Fully operational. Shipping worldwide, on schedule.Customs & duties included in the price

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Flex Paste, 1 lb Jar, Black, Waterproof Paintable Putty, Spackle Sealant, Fill Gaps Cracks Holes - Block Out Water and Air - UV Resistant - Walls, Drywall, EPDM, Concrete, Roof, RV Repairs

Flex Paste, 1 lb Jar, Black, Waterproof Paintable Putty, Spackle Sealant, Fill Gaps Cracks Holes - Block Out Water and Air - UV Resistant - Walls, Drywall, EPDM, Concrete, Roof, RV Repairs

Product ID: 267848373

Details

Brand
Flex Paste
Item dimensions L x W x H
10.8 x 10.8 x
Material
Rubber
Style
1 lb Black
Water resistance level
Waterproof

🌊Dries underwater, seals gaps instantly

💪Strong, flexible rubberized barrier

🛡️Waterproof & UV resistant

426 Lei

Duties & taxes included

In stock

Sold byAmazon RomaniaDelivered 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 Romania.

Secure transaction

Description

🛠️ Flex Paste: Seal, Protect, and Never Look Back!

SEAL LIKE A PRO - Blocks air, water & moisture with a durable, flexible rubberized layer
STAY FRESH TECH - Innovative airtight container locks in freshness—no wasted paste
PAINT IT YOUR WAY - Fully paintable after curing to match any aesthetic or project
MULTI SURFACE MASTER - Works on concrete, drywall, metal, EPDM, and more—indoor & outdoor ready
UNDERWATER APPLICATION - Unique formula cures underwater for ultimate versatility

Flex Paste is a premium 1 lb black waterproof sealant paste that creates a strong, flexible, rubberized barrier to block air, water, and moisture. It features a stay-fresh container to prevent waste, cures underwater, and is fully paintable. Ideal for filling large gaps, cracks, and holes on a wide range of surfaces including concrete, drywall, metal, and EPDM, making it perfect for professional-grade indoor and outdoor repairs, DIY projects, and more.

Specifications

ASIN	B084TDS8S5
Best Sellers Rank	#102,257 in Tools & Home Improvement ( See Top 100 in Tools & Home Improvement ) #171 in Putty Knives
Brand	Flex Paste
Brand Name	Flex Paste
Color	Black
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
Customer Reviews	3.8 out of 5 stars 3,159 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	1 Pounds
Item dimensions L x W x H	10.8 x 10.8 x 6.4 centimeters
Item weight	1 Pounds
Manufacturer	Swift Response, LLC
Material	Rubber
Material Type	Rubber
Model	FLEX SEAL - PFSBLKR16 - BLACK
Number of Items	1
Number of Packs	1
Part Number	PFSBLKR16
Style	1 lb Black
Style Name	1 lb Black
Supported Standards	ASTM C-920
Surface Recommendation	Windows,Doors
UPC	850010226804
Unit Count	1 Count
Water Resistance Level	Waterproof
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

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

N**C

Saved my Planter

Worked great to seal a beloved planter that was damaged by the weed eater. I don't have to worry about all of the dirt and water running out of it. Easy to apply and set up quickly.

29.07.2026

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426 Lei

Duties & taxes included

In stock

Sold byAmazon RomaniaDelivered 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 Romania.

Secure transaction

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TrustScore 4.5 | 7,300+ reviews

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