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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Radiator and Plastic Repair Kit, 2120, 59 grams

Radiator and Plastic Repair Kit, 2120, 59 grams

Product ID: 261494416

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📏Repairs up to 4"

🔧Easy to use

🛠️Permanent bond

Description

🔧 Fix it right the first time!

🚀 INSTANT FIX - No need to remove the radiator!
🌟 TRUSTED BRAND - Over 40 years of reliability in repairs.
📏 VERSATILE REPAIRS - Handles holes up to 3/8" and cracks up to 4".
🕒 QUICK APPLICATION - Fix leaks in minutes with simple instructions.
🔒 UNMATCHED STRENGTH - World's strongest bond for lasting repairs.

The J-B Weld Radiator and Plastic Repair Kit (Model 2120) is a comprehensive solution for making professional-quality, permanent repairs to radiators and plastic tanks. This kit includes epoxy putty, fiberglass cloth, sandpaper, and an applicator, allowing users to easily fix leaks without removing the radiator. With a proven track record of over 40 years, J-B Weld continues to deliver the strongest bond for all your repair needs.

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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