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, Radiator and Plastic Repair Kit, 2120, 59 grams

Product ID: 261494416

Details

Brand
J-B Weld
Item form
Putty
Material
Plastic Resin
Special features
Stops Leaks
Specific uses for product
Radiator and

🔧Repairs holes up to 3/8" & cracks up to 4"

⏱️Quick fix, no tank removal needed

🛠️Permanent professional-grade bond

S$34

Duties & taxes included

In stock

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Description

🛠️ Seal the deal with confidence—don’t let leaks slow your hustle!

TRUSTED LEGACY - Over 40 years of innovation and reliability trusted by pros and DIYers alike.
COMPLETE REPAIR KIT - Includes epoxy putty, fiberglass cloth, sandpaper, and applicator for a professional finish every time.
EFFORTLESS LEAK STOPPING - Fix radiator and plastic tank leaks without dismantling—save time and hassle.
PRECISION REPAIR CAPACITY - Seals holes up to 3/8" diameter and cracks up to 4" long—perfect for critical radiator fixes.
DURABLE LONG LASTING BOND - State-of-the-art epoxy putty and fiberglass cloth create a repair that stands the test of time.

J-B Weld Radiator and Plastic Repair Kit 2120 offers a professional-grade, permanent solution for radiator and plastic tank leaks. This 59-gram kit includes epoxy putty, fiberglass cloth, sandpaper, and an applicator, enabling quick repairs of holes up to 3/8" and cracks up to 4" without removing the tank. Trusted for over 40 years, it delivers durable, leak-stopping performance favored by automotive pros and DIY enthusiasts.

Specifications

ASIN	B01IOPE66G
Best Sellers Rank	#9,977 in Automotive ( See Top 100 in Automotive ) #50 in Automotive Fillers, Adhesives & Sealants
Brand Name	J-B Weld
Compatible Material	Metal
Container Type	Tube
Country Of Origin	USA
Customer Reviews	4.0 4.0 out of 5 stars (1,032)
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
Material Type	Plastic Resin
Model	2120
Number of Pieces	1
Other Special Features of the Product	Stops Leaks
Part Number	2120
Specific Uses For Product	Radiator and Plastic Repair
UPC	043425021205
Unit Count	1 Count
Warranty Description	1

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