Quick Guide: Where Does JB Weld Work Best?

If you are engaged with any repairing work, then you must have heard of JB weld. Well, it is a multi-use product everyone always raves about.

Wondering what all these fusses about? Want to know where does JB weld work on?

Well, if you are curious to know more about this star of the show, then you are at the right place. We will discuss the application and other perspectives of JB weld in a minute.

But before that, let’s know what JB weld is and how it works? So, without further due, let’s jump deep.

What is JB weld?

JB weld is a two-part epoxy weld. It is also known as a cold weld. It provides a strong and permanent bond. 

JB weld takes up to 15-24 hours to fully cure. And when it is completely cured, you can sand, file, drill, or even paint it.

It has a tensile strength of 5020 Psi. And it can withstand heat up to 550 degrees Fahrenheit.

Steps in preparing and applying JB Weld

You need to prepare the mixer first. First, measure an equal amount of chemical from both the tubes. This also refers to the 1:1 ratio.

Then mix these two-part with the help of a mixing stick. Mix thoroughly to ensure the mixer hardens when cured. If the mixer isn’t properly done, the weld will not harden. After this, just apply it to the desired surface and let it cure. Your job is done.

What surfaces does JB weld adhere to?

JB weld is a multi-use quick fix for all your problems. From a simple broken tool to a cracked engine, JB weld can fix anything for you. 

There are a wide variety of things JB weld works on. Such as:

  • Automobile parts-engine etc.
  • Brick.
  • Metals-aluminum, iron, copper, etc.
  • Fiberglass.
  • Concrete.

You can repair any of these with the help of JB weld.

What are the common applications of JB Weld?

You can use JB weld on a wide range of works. Some of the most common applications of JB weld are:

  • Household repair.
  • Plumbing.
  • Marine- parts, boats.
  • Craft and industrial projects.
  • Automobile.

There is almost nothing JB weld can’t fix for you.

Can JB Weld fix a cracked block?

JB weld can come in handy to fix a cracked engine block. But only if the crack is external, then you can repair it with JB weld.

First, you need to clean off the surface. Then grind the cracked surface and fill it with JB weld. Give it the proper time to cure completely. Now, you are good to go.

But there are a few things you need to keep in mind. The surface you are using JB weld on must not heat up above 550 degrees Fahrenheit. 

And the pressure on the weld should be less than the tensile strength of the weld.

Can you use JB Weld on an air compressor tank?

Well, the answer is NO. You shouldn’t attempt to do so. 

An air compressor tank is a high-pressure vessel. So, using epoxy is not the ideal solution. It will not withstand the pressure. 

In case of a crack or hole in the air compressor tank, you better replace the tank. Because even if you see only one crack, trust me; there are hundreds of them already on the tank. So, just welding it is not efficient. 

And if you can’t replace the tank, then go for arc welding for the time being.

Frequently Asked Questions (FAQs)

Now, let’s have a look at some common questions that may arise in your mind regarding JB weld.

Question: Does JB weld work on aluminum?

Ans: JB weld works on most of the metal surfaces including aluminum. One of the exceptions will be lead.

Question: Does JB weld work on plastic?

Ans: Well, JB weld is not quite compatible with plastic. So, for plastic material, try to find which type of plastic it is. And then look for an adhesive compatible with it.

Question: Can I use JB weld as body filler?

Ans: We will not recommend using JB weld as body filler. As the epoxy weld dries very hard. So, it will not be able to provide enough flexibility.  Instead, you can opt for JB putty as body filler. 

Question: Can JB weld work on a laptop?

Ans: Depends on which laptop part you are trying to fix. JB weld can help you repair a broken laptop hinge.

Question: Does JB weld work on a fiberglass boat?

Ans: Yes, JB weld works great on any fiberglass. So, you can surely repair your fiberglass boat with JB weld.

Question: Does JB weld work on wood?

Ans: Absolutely, we can fix any wooden piece with JB weld. It will give a permanent fix.

Question: Does JB weld work with Rubber?

Ans: Unfortunately, NO. JB weld is not the right adhesive for any rubbery surface or work piece.

Question: Will JB weld work with cast iron?

Ans: JB weld work on most of the metals. Cast iron is another great option to work with JB weld.

Question: Will JB weld work with gasoline?

Ans: JB weld is gas and oil resistant. So, you can fairly say JB weld will work with gasoline.

Question: Is JB weld waterproof?

Ans: JB weld is also water-resistant. So, you can use it for any projects that will come in contact with water.

Question: Is JB weld Toxic?

Ans: Well, it is not toxic. And it is also safe to drink water. So, use it on any plumbing repairing as well.


JB weld is your quick and easy savior. You can fix almost anything with it.

The range of work you can do with JB weld is vast. So, you don’t have to wonder where does JB weld work on

Once you invest in it, you will find yourself using JB weld on multiple surfaces and metals. It will provide you a strong and permanent solution.

Of course, there will be exceptions. Such as, you can’t use JB weld rubber or lead. Some of the automobile parts are also not compatible. You need to consider the temperature and pressure as well.

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