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Q: Does this work on aluminum ?

Yes, it is absolutely miraculous. It exceeded my expectations.

Q: 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

Q: Does j-b weld 2120 really work on radiatots?

It does if you work fast with it.

Q: 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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🛠️ Seal it, fix it, forget it — the pro’s choice for leak-proof confidence!

COMPLETE REPAIR KIT - Includes epoxy putty, fiberglass cloth, sandpaper, and applicator brush for a seamless fix.
NO DISASSEMBLY NEEDED - Stop leaks without removing tanks—save time and avoid hassle.
VERSATILE APPLICATION - Perfect for radiators, washer fluid tanks, storage tanks, and more—plastic or metal surfaces.
PRECISION CRACK HOLE REPAIR - Fixes cracks up to 4 inches and holes up to 3/8 inch diameter with professional-grade epoxy.
TRUSTED AMERICAN CRAFTSMANSHIP - Proudly made in the USA, ensuring durability and reliability you can count on.

The J-B Weld 2120 Radiator & Plastic Repair Kit is a comprehensive, professional-grade solution designed to repair cracks up to 4 inches and holes up to 3/8 inch in plastic and metal tanks. Ideal for radiators, washer fluid tanks, and storage tanks, this all-in-one kit includes epoxy putty, fiberglass cloth, sandpaper, and an applicator brush. Made in the USA, it offers a durable, no-disassembly-needed fix that saves time and prevents leaks with trusted quality.

Have a Question? See What Others Asked

Does this work on aluminum ?

why it is temp fix? crack due to vibration? how long it can last?

Does j-b weld 2120 really work on radiatots?

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.

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TrustScore 4.5 | 7,300+ reviews

Anjali K.

The product quality is outstanding. Exactly what I needed for my work.

1 month ago

Abdullah B.

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

3 weeks ago

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Trustpilot

TrustScore 4.5 | 7,300+ reviews

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The product exactly matches the description. Very satisfied with my purchase.

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Customer service was outstanding when I had questions about the product.

2 days ago

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Manufacturer	J-B Weld
Brand	J-B Weld
Product Dimensions	5.08 x 10.16 x 20.32 cm; 50 g
Item model number	2120
Is Discontinued By Manufacturer	No
Item Dimensions L x W x H	5.1 x 10.2 x 20.3 cm
Item Weight	50 g

J-B Weld 2120 ラジエーター&プラスチック修理キット

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