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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2120 Radiator Repair Kit

Product ID: 32648339

Details

Brand
J-B Weld
Item Form
Liquid
Material
Plastic Resin
Special Feature
No Removal
Specific Uses For Product
Repair

🔧Permanent professional-grade bond

⏱️No removal, quick fix

🛠️Versatile on plastics & metals

HK$241

Duties & taxes included

In stock

Sold byAmazon Hong KongDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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

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Description

🔥 Seal leaks like a pro—no teardown, no hassle!

TRUSTED LEGACY - Over 40 years of delivering the world’s strongest bond trusted by pros and DIYers alike.
COMPLETE REPAIR KIT - Includes epoxy putty, fiberglass cloth, sandpaper, and applicator for a seamless fix.
MULTI SURFACE MASTERY - Works flawlessly on radiators, plastic tanks, PVC, composites, and more.
EFFORTLESS LEAK REPAIR - Fix holes up to 3/8" and cracks up to 4" without removing your radiator or tank.
DURABILITY YOU CAN COUNT ON - Engineered for permanent, professional-quality repairs that stand the test of time.

The J-B Weld 2120 Radiator Repair Kit offers a professional-grade, permanent solution for repairing leaks in radiators and plastic tanks without removal. Featuring a complete set of epoxy putty, fiberglass cloth, sandpaper, and applicator, it handles holes up to 3/8" and cracks up to 4" on multiple surfaces including metal and plastic. Trusted for over 40 years, this versatile kit delivers the world’s strongest bond, making it a must-have for mechanics and DIY enthusiasts aiming for durable, hassle-free fixes.

Specifications

ASIN	B01IOPE66G
Best Sellers Rank	#15,195 in Automotive ( See Top 100 in Automotive ) #2 in Radiator Sealers #791 in Oils & Fluids
Brand Name	J-B Weld
Compatible Material	Metal
Customer Reviews	4.1 4.1 out of 5 stars (1,068)
Global Trade Identification Number	00043425021205
Included Components	Epoxy Putty^Fiberglass Cloth^Sand Paper^Applicator Brush
Item Form	Liquid
Item Package Quantity	1
Item Type Name	Radiator and Plastic Repair Kit
Item Weight	50 g
Manufacturer	JBWeld
Material Type	Plastic, Resin
Model	2120
Number of Pieces	1
Other Special Features of the Product	No Removal Required
Part Number	2120
Specific Uses For Product	Repair
UPC	043425021205
Unit Count	1 Count
Warranty Description	As Labelled

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How is product pricing calculated?+

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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HK$241

Duties & taxes included

In stock

Sold byAmazon Hong KongDelivered 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 Hong Kong.

Secure transaction

Trustpilot

TrustScore 4.5 | 7,300+ reviews

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The delivery time was excellent, and the packaging was secure.

2 months ago

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

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