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: 109526954

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Description

🚗 Fix it right the first time with J-B Weld!

TRUSTED FOR DECADES - Join the ranks of loyal users who trust J-B Weld for their repairs.
QUICK FIX NO REMOVAL - Stop leaks without removing the radiator or tank.
USER FRIENDLY INSTRUCTIONS - Includes easy-to-follow instructions for hassle-free application.
VERSATILE FOR ALL PROJECTS - Perfect for radiators, tanks, plastics, and more.
PROFESSIONAL QUALITY REPAIRS - Achieve permanent repairs with state-of-the-art components.

The J-B Weld 2120 Radiator Repair Kit is a comprehensive solution for making professional-quality, permanent repairs to radiators and plastic tanks. With easy-to-follow instructions and no need for removal, this kit includes epoxy putty, fiberglass cloth, sandpaper, and an applicator, making it perfect for both DIY enthusiasts and professionals alike.

Specifications

Manufacturer	JBWeld
Brand	J-B Weld
Model	J-B Weld 2120 Radiator and Plastic Repair Kit
Product Dimensions	5.08 x 10.16 x 20.32 cm; 50 g
Item model number	2120
Manufacturer part number	2120
Item Weight	50 g

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