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  • J-B Weld 38237 FiberWeld 2 in. W x 36 in. L Automotive Repair Cast Kit, Black
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J-B Weld 38237 FiberWeld 2 in. W x 36 in. L Automotive Repair Cast Kit, Black

4.2 out of 5 stars 802 ratings
鶹's Choice highlights highly rated, well-priced products available to ship immediately.
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Purchase options and add-ons

Brand JB Weld
Specific uses for product Repair, Flooring, Masonry, Countertop, Furniture, Wood, Wall Repair, Glass, Table Top Coating
Material Fiberglass
Compatible material Fibreglass
Item form item_form

About this item

  • FIBERWELD AUTOMOTIVE REPAIR CAST: A high-strength fiberglass wrap, impregnated with a specially-formulated resin for automotive repairs. When activated by water, the product forms a strong, permanent bond that hardens like steel in 15 minutes. Once cured, FiberWeld is temperature resistant up to 400°F and holds water pressure up to 100 PSI.
  • SOAK IT, WRAP IT, DONE: Once the wrap is dipped in water for 5-7 seconds, FiberWeld Automotive Repair Cast has a working time of about 5 minutes and a cure time of 15 minutes! The product achieves full strength in about 2 hours.
  • PRODUCT FEATURES AND STRENGTH: Once fully cured, J-B Weld FiberWeld Automotive Repair Cast has a temperature resistance of 400°F, holds water pressure up to 100 PSI, and can be sanded and painted!
  • AUTOMOTIVE APPLICATIONS: Radiator & heater hoses, tailpipes & mufflers, oil & transmission lines, vacuum lines, outside mirrors & roof racks, and RV & boat emergency repairs.
  • EVERYTHING YOU NEED: The kit includes a pair of gloves and a 2" x 24" securing bandage!
  • DO IT YOURSELF: Big or small, you can DIY it with J-B Weld. Our heavy duty epoxy and adhesives repair & restore it right the first time. J-B Weld delivers superior performance, quality, and results for the World’s Strongest Bond.
› See more product details

Product details

  • Product Dimensions ‏ : ‎ 3.81 x 12.55 x 19.99 cm; 82 g
  • Date First Available ‏ : ‎ July 27 2021
  • Manufacturer ‏ : ‎ J-B Weld
  • Place of Business ‏ : ‎ MARIETTA, GA, 30068 US
  • ASIN ‏ : ‎ B09BBGS7CN
  • Item model number ‏ : ‎ 38237
  • Country of origin ‏ : ‎ USA
  • 鶹 Rank: #8,056 in Automotive (See Top 100 in Automotive)
  • Customer Reviews:
    4.2 out of 5 stars 802 ratings

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Product description

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From the manufacturer

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About Us

JB Weld offers a complete, innovative range of products to help DIYers of all skill levels confidently pull off projects both big and small, from the workshop to the garage to the home. Our mission is to help you tap into the confidence and self-reliance you already have to help you Be Your Strongest Self. The J-B Weld Company was founded in 1969 by Sam and Mary Bonham. we continue to provide one of the world's strongest bond for your repair projects.

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Customer reviews

4.2 out of 5 stars
802 global ratings

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Customers say

Customers like the functionality, durability, and ease of application of the bonding adhesive. They mention it works great for repairs, is very resistant, and holds up well. However, some customers have reported that it's very sticky. Opinions are mixed on the ease of application.

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FunctionalityDurabilityEase of applicationStickiness
5 customers mention "Functionality"5 positive0 negative

Customers are satisfied with the functionality of the product. They mention it works great for repairs and JB Weld makes fantastic products.

"Works really well for our repair, but I would suggest adding some structural material to the repair. The JB weld not strong enough by itself." Read more

"JB Weld makes fantastic products. I've used many over many years. This one though, is a disaster...." Read more

"Worked Great..." Read more

"Worked as advertised!..." Read more

4 customers mention "Durability"4 positive0 negative

Customers are satisfied with the durability of the product. They mention it's very resistant, the repair is strong, and the tape is holding up well, even under high heat and regular use.

"...damaged area, and the heat from the exhaust cures it quickly. • Durable: After driving for a week, the tape is holding up well, even under..." Read more

"Repaired broken aluminum handle on whipper snipper. Repair is strong and easy to apply...." Read more

"It hardened like a steel it a nice buy for me" Read more

8 customers mention "Ease of application"5 positive3 negative

Customers have mixed opinions about the ease of application of the product. Some mention it's straightforward, while others say it's difficult to work with and doesn't work even if you do everything as suggested.

"...What I Liked: • Easy to Use: The application was straightforward—just wrap it around the damaged area, and the heat from the exhaust cures it..." Read more

"...This one though, is a disaster. Messy, sticky, unreliable, difficult to work with and awkward to position. Try some other JB Weld product." Read more

"...Repair is strong and easy to apply. Fumes caused serious eye irritation and required repeated flushing. Should use outdoors with a breeze...." Read more

"...The instructions were clear and came with everything you needed for the job...." Read more

4 customers mention "Stickiness"0 positive4 negative

Customers are dissatisfied with the stickiness of the product. They mention it's very sticky.

"...I've used many over many years. This one though, is a disaster. Messy, sticky, unreliable, difficult to work with and awkward to position...." Read more

"...Note - its very, very sticky during installation..." Read more

"Very sticky..." Read more

Top reviews from Canada

Translate all reviews to English
  • Chan
    5.0 out of 5 stars Worked Great
    Reviewed in Canada on June 5, 2025
    Verified Purchase
    Used for a small leaked on my motorcycle exhaust and it worked and held up for now.
    Helpful
     Report
  • Nathan
    5.0 out of 5 stars Fixed exhaust leak
    Reviewed in Canada on January 14, 2025
    Verified Purchase
    I used JB Weld Exhaust Tape to repair a small leak in my exhaust pipe, and it worked perfectly!

    What I Liked:
    • Easy to Use: The application was straightforward—just wrap it around the damaged area, and the heat from the exhaust cures it quickly.
    • Durable: After driving for a week, the tape is holding up well, even under high heat and regular vibrations.
    • Cost-Effective: A budget-friendly solution to fix minor exhaust issues without the need for professional repairs.

    This tape saved me time and money, and I’d recommend it to anyone looking for a reliable temporary fix for small exhaust leaks!
    Helpful
     Report
  • redrib
    4.0 out of 5 stars Use caution from fumes
    Reviewed in Canada on August 30, 2024
    Verified Purchase
    Repaired broken aluminum handle on whipper snipper. Repair is strong and easy to apply.
    Fumes caused serious eye irritation and required repeated flushing. Should use outdoors with a breeze. I reviewed the SDS for product and it does indicate health risks to be taken seriously. Manufacturer should add SDS TO PACKAGING.
    Helpful
     Report
  • Alex Super S
    5.0 out of 5 stars Works well for our repair
    Reviewed in Canada on March 25, 2025
    Verified Purchase
    Works really well for our repair, but I would suggest adding some structural material to the repair. The JB weld not strong enough by itself.
    Helpful
     Report
  • 鶹 Customers
    3.0 out of 5 stars Third times a charm
    Reviewed in Canada on November 14, 2024
    Verified Purchase
    I bought this product three times and the first two times worked out so I ended up buying it a third time same reason different area and so far so good I live in a area where we’re in rainy season now and the previous products that I bought in did not hold up underwater like they do. They did hold up but as soon as they got wet, they got fragile brittle and cracked and started leaking again where this is more of a fibreglass and it stays permanent. Hopefully, it’ll work till next spring, where I can replace the pipes, but so far so good fingers crossed.
    Helpful
     Report
  • sammy martin
    5.0 out of 5 stars Nice product
    Reviewed in Canada on February 11, 2025
    Verified Purchase
    It hardened like a steel it a nice buy for me
    Helpful
     Report
  • Michael Weiss
    1.0 out of 5 stars Very difficult to work with and doesn't work even if you do everything as suggested.
    Reviewed in Canada on June 27, 2025
    Verified Purchase
    JB Weld makes fantastic products. I've used many over many years. This one though, is a disaster. Messy, sticky, unreliable, difficult to work with and awkward to position. Try some other JB Weld product.
    Helpful
     Report
  • Line Gauthier
    5.0 out of 5 stars très résistant
    Reviewed in Canada on February 15, 2024
    Verified Purchase
    Il faut avoir de l'espace pour le travailler. Il est très collant, mais résistant.
    Helpful
     Report

Top reviews from other countries

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  • Kos3838
    4.0 out of 5 stars Passt alles
    Reviewed in Germany on June 9, 2024
    Verified Purchase
    Habe noch nicht probiert
    Report
  • Tanguy
    1.0 out of 5 stars Un día y se fue... Qué triste.
    Reviewed in Mexico on May 9, 2024
    Verified Purchase
    Vivo lejos de la ciudad y esperaba que esto funcionara. Hice todo de la manera correcta y lo dejé secar toda la noche…. pero cuando llevé mi Quad para probarlo, duró un día y toda la resina se partió en dos. Y ahora estoy de vuelta al punto de partida. Mi silenciador se rompió nuevamente y este producto fue una total pérdida de dinero. Estoy muy triste ahora.
    Report
  • Roderick Buchbach
    5.0 out of 5 stars Pressure pipe repair
    Reviewed in Australia on June 30, 2025
    Verified Purchase
    Used this product on a 4" galvanised water pipe that runs about 60-70 psi.
    Sealed a pinhole brilliantly whilst we waited for a replacement pipe.
    Report
  • Daniel Dé Freitas
    5.0 out of 5 stars Muy buena calidad
    Reviewed in the United States on June 20, 2025
    Verified Purchase
    Calidad buena
    Report
  • Michael
    5.0 out of 5 stars Great product
    Reviewed in the United States on April 19, 2025
    Verified Purchase
    I've used this before and it's by far the best out of all the other similar products. If you follow the instructions, it last for a long time. They just have to remember to prep the surface correctly. And it will last. I had to repair my exhaust because someone stole my catalytic converter a year ago. And the repair lasted a year. ⭐⭐⭐⭐⭐
    Report