Does this work on aluminum ?

Yes, it is absolutely miraculous. It exceeded my expectations.

why it is temp fix? crack due to vibration? how long it can last?

It will usually last a year as long as the car does not overheat which can cause too much pressure on the patched area

Does j-b weld 2120 really work on radiatots?

It does if you work fast with it.

I have a leak on a small stem (i think is aluminum) at the seam that holds a small rubber hose that antifreeze runs though, the small stem gets hot.

My honest opinion is this isn't going to work for your issue.... I used this on my plastic radiator at the top in small crack. It worked for couple weeks and had to buy new radiator... don't waste your money

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J-B Weld 2120 Radiator Repair Kit

Product ID: 109526954

Details

Brand
J-B Weld
Item form
Putty
Item package quantity
1
Material
Plastic Resin
Special feature
Stops Leaks

🔧Repairs holes up to 3/8" & cracks 4"

⏱️No tank removal, quick fix

🛠️Permanent professional-grade bond

C$3415

Duties & taxes included

In stock

Sold byAmazon NicaraguaDelivered 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 Nicaragua.

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Description

🛠️ Seal it, fix it, forget it—your radiator’s new best friend!

VERSATILE RELIABLE - Works on metal, plastic, composites, PVC—trusted by pros and DIYers alike.
ALL IN ONE REPAIR KIT - Includes epoxy putty, fiberglass cloth, sandpaper, and applicator for a seamless DIY experience.
DURABILITY YOU CAN TRUST - Backed by 40+ years of innovation delivering the world’s strongest bond.
EFFORTLESS LEAK STOPPING - Fix radiator and plastic tank leaks without removing parts—save time and hassle.
PRECISION REPAIR CAPACITY - Effectively seals holes up to 3/8" diameter and cracks up to 4" long for lasting results.

The J-B Weld 2120 Radiator Repair Kit offers a professional-grade, permanent solution for radiator and plastic tank leaks. Designed for quick, no-removal repairs, it includes epoxy putty, fiberglass cloth, sandpaper, and an applicator to fix holes up to 3/8" and cracks up to 4". Trusted for over 40 years, this versatile kit works on metal, plastic, composites, and PVC, making it a must-have for mechanics and DIY enthusiasts seeking durable, reliable fixes.

Specifications

ASIN	B01IOPE66G
Best Sellers Rank	107,940 in Automotive ( See Top 100 in Automotive ) 606 in Fillers, Adhesives & Sealants
Brand	J-B Weld
Compatible Material	Metal
Container Type	Dough
Country Of Origin	USA
Customer Reviews	4.0 4.0 out of 5 stars (1,033)
Global Trade Identification Number	00043425021205
Included Components	Epoxy Putty^Fiberglass Cloth^Sand Paper^Applicator Brush
Item Form	Putty
Item Package Quantity	1
Item Type Name	Radiator and Plastic Repair Kit
Item Weight	50 Grams
Manufacturer	JBWeld
Manufacturer Part Number	2120
Material	Plastic Resin
Model Number	2120
Number of Pieces	1
Other Special Features of the Product	Stops Leaks
UPC	043425021205
Unit Count	1.0 count

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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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C$3415

Duties & taxes included

In stock

Sold byAmazon NicaraguaDelivered 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 Nicaragua.

Secure transaction

Trustpilot

TrustScore 4.5 | 7,300+ reviews

Abdullah B.

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

3 weeks ago

Imran F.

Very reliable shop with genuine products. Will definitely buy again!

2 weeks ago

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