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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WE SOURCE ITEMS FROM

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Customer Support

Our Other Brands:Hewyn|Selfship

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
Item weight
1 Pounds
Material
Rubber
Style
1 lb Black

🌊Dries underwater

🖌️Fully paintable finish

🛡️Waterproof & UV resistant seal

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Rp1104296

Duties & taxes included

In stock

Sold byAmazon IndonesiaDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Description

🛠️ Seal it, paint it, forget it — the last putty your projects will ever need!

PAINT IT YOUR WAY - Once cured, paint over it seamlessly to match any décor while preventing rust and UV damage.
STAY FRESH CONTAINER - Innovative airtight jar locks in freshness to prevent waste and extend sealant life.
DIY PROVEN DURABILITY - Super thick paste fills large gaps instantly and even cures underwater for tough repairs.
ULTIMATE WATERPROOF DEFENSE - Blocks air, water & moisture with a flexible rubberized barrier for lasting protection.
VERSATILE SURFACE COMPATIBILITY - Seals cracks and holes on drywall, concrete, EPDM, roofs, RVs, and more—indoors or outdoors.

Flex Paste 1 lb Black is a premium waterproof, paintable putty designed to fill and seal gaps, cracks, and holes across multiple surfaces including drywall, concrete, and EPDM. Its flexible, rubberized formula blocks air, water, and UV rays, cures underwater, and comes in a stay-fresh container to maximize usability. Ideal for professional-grade indoor and outdoor repairs, it offers a durable, paintable finish that prevents rust and corrosion.

Specifications

ASIN	B084TDS8S5
Best Sellers Rank	#97,266 in Tools & Home Improvement ( See Top 100 in Tools & Home Improvement )
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 3,134 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 dimensions L x W x H	10.8 x 10.8 x 6.4 centimeters
Item form	Paste
Manufacturer	Swift Response, LLC
Material	Rubber
Material Type	Rubber
Model	FLEX SEAL - PFSBLKR16 - BLACK
Number of Items	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

F**T

loved it

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

G**N

Great filler.

19.04.2026

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

L**K

Good stuff, simple to use

18.04.2025

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