Frequently Asked Questions: JB Weld and JB Kwik FAQ

Q: How much heat can J-B Weld withstand?
A: J-B Weld can withstand a constant temperature of 500F (260C). The maximum temperature threshold is approximately 600F (315C) for a short time (~10 minutes).

Q: Will J-B Weld work on an automotive exhaust?
A: Because of the extreme temperatures of exhaust systems, we do not recommend J-B Weld for use on exhaust manifolds and catalytic converters. Nor do we recommend the product for repairs within the combustion chamber.

Q: How can I remove J-B Weld after it is fully cured?
A: When fully cured, J-B Weld can only be removed by grinding or filing it off, or by directly heating the product above the 600F maximum temperature threshold.

Q: Is J-B Weld available in larger sizes?
A: J-B Weld and J-B Kwik are both available in the standard 2 oz (55 gram) pack or a larger 10 oz (280 gram) pack suitable for larger workshops. The 10oz Professional pack size consists of 5 ounces of resin and 5 ounces of hardener for a total of 10 oz. of usable product.

Q: Is J-B Weld toxic?
A: No. J-B Weld is non-toxic. However, we do not recommend consuming the product.

Q: What can I use as a surface cleaner before using J-B Weld?
A: We recommend using acetone or lacquer thinner. In the absence of these two, soap and water can be used. Just be sure that the surface is completely dry before applying J-B Weld. DO NOT use alcohol, or any other "cleaner" that will leave a petroleum residue.

Q: Is J-B Weld resistant to water and/or gasoline?
A: When fully cured, J-B Weld is completely resistant to water, gasoline, and about every other petroleum product or automotive chemical. For wet-surface or submerged water or gasoline repairs, we recommend either J-B Stik or J-B WaterWeld.

Q: Will J-B Weld hold up to extremely cold temperatures?
A: J-B Weld has proven to maintain its characteristics to temperatures as low as -67F (-55C).

Q: Will J-B Weld conduct electricity?
A: No. J-B Weld is not considered to be a conductor. It is an insulator.

Q: What is the tensile strength of J-B Weld and J-B Kwik?
A: J-B Weld has a tensile strength of 3,960 psi. J-B Kwik has a tensile strength of 2,424 psi. For more physical properties information, please see the technical datasheets on each product (listings on each are in this category).

Q: What is the difference between J-B Weld and J-B Kwik?
A: The simple answer is that J-B Kwik is about half as strong as J-B Weld in both strength and heat resistance. The other differences are somewhat obvious by the name. J-B Kwik sets in 4 minutes and cures in 4-6 hours, whereas J-B Weld sets in 4-6 hours and cures in 15-24 hours.

Q: Is there anything that J-B Weld WON'T bond to?
A: J-B Weld will not adhere to, or bond well to: any flexible rubber surface, leather, vinyl, canvas, polypropylene plastic or polyethylene plastic

Q: What color is J-B Weld when it cures? Is it clear?
A: J-B Weld cures to a very dark gray (steel-like) color.

Q: Do you make a J-B Weld specific for aluminum or stainless steel?
A: J-B Weld works great on ANY metal surface (lead is an exception). Use as directed on package and J-B Weld will get the job done.

Q: Can I thin J-B Weld to make it pour easier?
A: Yes. Add up to 1 teaspoon of acetone or lacquer thinner per 2 oz. (1 full package) of mixed product.

Q: Is J-B Weld microwave safe?
A: Yes.


This product was added to our catalog on Wednesday 11 January, 2012.

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