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: 32648339

Details

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

🔧Versatile on plastics, metals & composites

⏱️No removal, quick fix up to 4" cracks

🛠️Permanent professional-grade bond

₨545

Duties & taxes included

In stock

Sold byAmazon SeychellesDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Description

🛠️ Seal it, fix it, forget it — the ultimate radiator repair kit for pros and DIYers alike!

PRO GRADE DURABILITY - Experience the world’s strongest bond trusted by mechanics for over 40 years.
ALL IN ONE REPAIR KIT - Includes epoxy putty, fiberglass cloth, sandpaper, and applicator for a seamless DIY fix.
VERSATILITY THAT WORKS - Perfect for radiators, plastic tanks, PVC, composites, and more—one kit, endless solutions.
EFFORTLESS LEAK STOPPING - Fix holes up to 3/8" and cracks up to 4" without removing your radiator or tank.
TRUSTED BY EXPERTS DI YERS - Join thousands who rely on J-B Weld for permanent, professional-quality repairs.

The J-B Weld 2120 Radiator Repair Kit delivers a permanent, professional-quality fix for leaks and cracks up to 4" long without tank removal. Featuring a complete set of epoxy putty, fiberglass cloth, sandpaper, and applicator, it bonds strongly to plastics, metals, and composites. Trusted for over 40 years, this versatile kit is a must-have for mechanics and DIY enthusiasts seeking fast, reliable radiator and plastic tank repairs.

Specifications

ASIN	B01IOPE66G
Best Sellers Rank	#10,641 in Automotive ( See Top 100 in Automotive ) #1 in Radiator Sealers #606 in Oils & Fluids
Brand Name	J-B Weld
Compatible Material	Metal
Customer Reviews	4.1 4.1 out of 5 stars (1,055)
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 Grams
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	1.0 Count
Warranty Description	As Labelled

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