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, 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 & Works Underwater

💪Super Thick, Flexible Rubber Paste

🛡️Waterproof & UV Resistant Seal

NZ$128

Duties & taxes included

In stock

Sold byAmazon New ZealandDelivered 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 New Zealand.

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Description

🛠️ Seal it. Flex it. Fix it. Forever.

SEAL LIKE A PRO - Creates a durable, watertight rubberized barrier that blocks air, water, and moisture for long-lasting protection.
PAINT IT YOUR WAY - Fully paintable once cured, letting you customize repairs to blend perfectly with your space or gear.
NO MORE WASTED PASTE - Innovative Stay Fresh container locks out air to keep your sealant fresh and ready for your next project.
BUILT FOR EVERY SURFACE - Adheres seamlessly to wood, metal, concrete, EPDM, and more—perfect for indoor and outdoor fixes.
UNDERWATER APPLICATION EASY - Apply and cure even underwater—ideal for marine, roof, and outdoor repairs where moisture is a challenge.

Flex Paste is a premium 1 lb black rubberized sealant designed to fill large gaps, cracks, and holes with a flexible, waterproof barrier. It works on a wide range of materials including concrete, metal, and EPDM, and uniquely cures underwater. The product comes in an air-tight Stay Fresh container to prevent waste, is UV resistant, paintable, and ideal for both indoor and outdoor repairs—from roofs and RVs to windows and foundations.

Specifications

ASIN	B084TDS8S5
Best Sellers Rank	#71,802 in Tools & Home Improvement ( See Top 100 in Tools & Home Improvement ) #95 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 3,141 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
Item weight	454 g
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

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

G**N

Great filler.

Very handy gap filler provides great flexibility.

19.04.2026

Common Questions

Are the products genuine and authentic?+

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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Delivery times vary by destination country, typically ranging from 3-9 business days. Each order is fully trackable through our system. We handle all customs clearance and use reliable courier partners for last-mile delivery. You'll receive regular updates about your order status via email and our app.

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Our prices include the product cost, international shipping, import duties, customs clearance, and local delivery charges. We handle all customs and import procedures, ensuring there are no hidden fees upon delivery. PRO members receive additional benefits including free shipping.

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TrustScore 4.5 | 7,300+ reviews

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The product exactly matches the description. Very satisfied with my purchase.

5 days ago

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Fast shipping and excellent packaging. The Leatherman tool feels very premium and sturdy.

1 day ago

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NZ$128

Duties & taxes included

In stock

Sold byAmazon New ZealandDelivered 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 New Zealand.

Secure transaction

Trustpilot

TrustScore 4.5 | 7,300+ reviews

Abdullah B.

Great price for an authentic product. Fast international shipping too!

3 weeks ago

Neha S.

Excellent communication throughout the order process. Product is perfect.

2 weeks ago

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