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

J-B Weld, Radiator and Plastic Repair Kit, 2120, 59 grams

Product ID: 261494416

Details

Brand
J-B Weld
Item form
Liquid
Item package quantity
1
Material
Plastic Resin
Unit count
1 Count

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

🔥Fixes leaks without tank removal

🛠️Permanent professional-grade bond

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160.55 DT

Duties & taxes included

In stock

Sold byAmazon TunisiaDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Description

🛠️ Fix it once, fix it right — the pro’s secret weapon!

PRECISION FIXES - Seamlessly repair holes up to 3/8" diameter and cracks up to 4" long with included fiberglass cloth.
COMPLETE REPAIR KIT - Everything you need in one box—epoxy, fiberglass, sandpaper, and applicator for a flawless finish.
UNMATCHED DURABILITY - State-of-the-art epoxy putty creates a bond that lasts, trusted for over 40 years.
EFFORTLESS LEAK REPAIR - No need to remove your radiator or tank—stop leaks fast and hassle-free.
TRUSTED BY PROS DI YERS - Join thousands who rely on J-B Weld for automotive repairs that stand the test of time.

J-B Weld Radiator and Plastic Repair Kit (59g) offers a professional-grade, permanent solution for radiator and plastic tank leaks. Designed for easy use without tank removal, it repairs holes up to 3/8" and cracks up to 4" using advanced epoxy putty and fiberglass cloth. Trusted for over 40 years, this all-in-one kit ensures durable, hassle-free automotive repairs.

Specifications

ASIN	B01IOPE66G
Best Sellers Rank	#7,009 in Automotive ( See Top 100 in Automotive ) #39 in Automotive Fillers, Adhesives & Sealants
Brand Name	J-B Weld
Compatible Material	Metal
Country Of Origin	USA
Customer Reviews	4.0 4.0 out of 5 stars (1,005)
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
Part Number	2120
UPC	043425021205
Unit Count	1 Count
Warranty Description	1

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Trustpilot

TrustScore 4.5 | 7,300+ reviews

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Excellent communication throughout the order process. Product is perfect.

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Great price for an authentic product. Fast international shipping too!

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