How much heat can J-B Weld withstand?

Original J-B Weld 2-part epoxy can withstand a constant temperature of 260ºC. The maximum temperature threshold is approximately 316ºC for a short term (10 minutes). Our ExhaustWeld Repair Wrap Kit is able to tolerate temperatures of 600ºC and is suitable for use along the entire length of the exhause system from the manifold to the tail pipe.

Refer to individual product packages for more temperature information.

Will J-B Weld hold up to extremely cold temperatures?

Original J-B Weld has proven to maintain its characteristics to temperatures as low as -55º C.

Will J-B Weld work on an automotive exhaust?

Yes! Exhaust systems can get very hot indeed! Our ExhaustWeld Total Exhaust System Repair Wrap is specifically designed for use along the entire exhaust system, from the super-hot manifold to the muffler and tailpipe, including the catalytic convertor. ExhaustWeld can tolerate temperatures of 600ºC.

How can I remove J-B Weld after it is fully cured?

When fully cured, J-B Weld can only be removed by grinding or filing it off, or by directly heating the product above the 600º maximum temperature threshold.

Is J-B Weld toxic?

No. When fully cured, J-B Weld is non-toxic. This means you can safely use J-B Weld for repairs on potable water tanks, fish ponds and kitchen utensils for example. However, we certainly do not recommend consuming our products. They work brilliantly but they are not tasty! Please do keep your unused J-B Weld products stored saftely away from children and pets.

Will J-B Weld conduct electricity?

No. J-B Weld is not considered to be a conductor. It is an insulator.

Is there anything that J-B Weld WON’T bond to?

While J-B Weld will bond to all most anything, there are a few materials that we do not recommend using it on. These include:

  • Any flexible rubber surface
  • Leather
  • Vinyl
  • Canvas
  • Polypropylene plastic (PP)
  • Polyethylene plastic (PET)

Can I thin J-B Weld to make it easier to pour?

Yes. Add up to one teaspoon of acetone or lacquer thinner per two ounces (one full package) of mixed product. Only do this if it is really necessary for the application at hand as cure time will be increased.

Is J-B Weld microwave safe?

Yes, J-B Weld is microwave safe once cured. Feel free to use it on your microwave-safe pots and pans in need of repairs.

How long will the tubes of J-B Weld last once open?

The tubes of J-B Weld will last up to 25 years once open, provided the caps are secured tightly between uses, although we are sure you will have used them much, much sooner than this.

Can I use J-B Weld to cover and repair a larger hole in a bucket or tank?

Yes you can. Here is a little trick you can use if the hole is a little larger: Take a piece of masking tape or even a leaf from a tree that is slightly larger than the hole itself. Place the leaf or tape over the hole and then cover over the area using J-B Weld Original. J-B Weld will cure and form a solid repair over the hole after which the tape can be removed. If using a leaf, you can leave it there to simply decay away over time too, leaving just the solid J-B Weld repair.

Help! I'm confused about which J-B Weld product is right for my project.

Don’t worry, we have you covered! Many of our products will work perfectly in a multitude of applications and surfaces. For outright strength and almost any application, look no further that our J-B Weld Original. For quick setting, go for our J-B Quik. Still not sure? Give our team a call or drop us an email and we will respond on the double. Reach us on:

Tel: Johanneburg: 011 392-1961 / Durban 031 569-2221