How Strong Is JB Weld? (Everything You Need To know)

JB weld is a pretty versatile glue and is used for a variety of materials, whether it’s wood, metal, ceramic, or glass. It is commonly used by DIYers as well as professionals and is suitable for various applications. 

From plugging cracks and holes to joining metal parts together or sealing leaks in pipes and machinery, it is used by everyone. 

There’s no denying that the glue is extremely strong, which is expected since it’s epoxy. But how strong is it? Let’s find out! 

How strong is JB weld

How strong is JB Weld?

JB Weld is an extremely strong epoxy glue with a tensile strength of 1300-5020 PSI depending on the composition. It can withstand temperatures up to 550 degrees F. 

The strength of JB weld is connected to the hardening property. This is why the glue needs to be allowed to fully cure once applied. For the best results, allow it to cure overnight or a full day. 

JB weld bonds are generally known to withstand a huge amount of stress and pressure without cracking. They can also resist harsh conditions such as high temperatures, corrosion, weathering, and chemicals.

The bond can last for several months or even years (but it’s best to use it as a temporary solution), while the product usually has a shell life of 3 years. 

Jb Weld Shear Strength

Shear strength is a measure of how much a material can withstand the force applied parallel to its surface.

The shear strength of JB weld varies depending on the type and curing time. As earlier indicated, the tensile strength of JB weld can be up to 5020 PSI when fully cured. In common engineering practice, the shear strength is one-half of the tensile strength. 

In general, the shear strength of JB Weld is usually less than that of traditional welding but still strong enough for load-bearing structures. 

JB Weld Compressive Strength

Compressive strength is a measure of how much an object can withstand a force applied perpendicular to its surface.

JB Weld offers high compressive strength, though not as much as that of traditional heat welding. 

Because of its hardening property, the glue is able to form strong, cohesive bonds. The compressive strength increases as it hardens, which is why it’s important you allow it to cure completely.   

Due to its compressive strength, JB weld is often used to fill cracks, repair holes and reinforce structures.

JB Weld strength vs welding

Despite its strength, JB weld is not as strong as traditional welds. 

Traditional welding involves the use of heat to melt and fuse the metals together. So, the joining occurs at a molecular level and produces a much stronger bond with higher load-bearing capacity.

Nevertheless, JB weld is still preferred for joining materials on many occasions, and this is for obvious reasons. It is easy to use and does not require any special equipment or setups. 

Also, traditional welding is not effective for certain materials such as wood and ceramic. In this case, JB Weld can be a viable solution. 

Types of JB Weld and their strength

JB weld comes in different formulations designed for different surfaces and conditions. They also differ in their curing time, as well as temperature and pressure resistance. 

Here are the different types of JB weld:

Original JB Weld

This is the most widely used type, and it works for a wide range of materials. However, it has a longer curing time than the other types. Specifically, it sets in 15 minutes and takes 15-24 hours to fully cure. 

It can withstand temperatures of up to 288°C or 550°F and is resistant to vibration and impact. It is particularly effective for bonding dissimilar materials.

JB Weld Steelstik

This type is a specially designed steel-reinforced epoxy adhesive. It is made specifically for bonding steel and other metals.

It is relatively stronger than Original JB Weld. It has a shorter curing time. Being able to set in 3-10 minutes and fully cure in an hour. 

It is made to be used on a wide variety of metal surfaces like copper, steel, and aluminum. 

It withstands temperatures of up to 149°C and has a tensile strength of 1800 PSI.

JB Weld Quickweld

This is a lot like the original JB weld, except it sets much faster. It has a setting time of 6 minutes and can fully cure in 4 hours. 

This glue can be used on almost as many surfaces as the JB original. It has a tensile strength of 3090 PSI and can withstand temperatures of 149°C.

This glue is suitable for household and DIY applications where speed is necessary.

JB Weld Marineweld

This JB weld type is specially formulated to withstand water and other chemicals. 

It is especially used for boat repairs, underwater, and other marine applications.

This glue has a longer curing time. It sets in 4-6 hours and fully cures in 15 to 24 hours. 

It can withstand temperatures of up to 288°C. It is resistant to saltwater, freshwater other marine environments.  

How much weight can JB weld hold?

The weight capacity of JB weld depends on the area it’s used, the material, and application technique. In general, JB Weld can hold large weights. For instance, on metals, it can hold up to 145 pounds of weight. 

For applications where weight capacity is critical, it is important you follow the manufacturer’s instructions, especially with regard to the curing time.

How long does JB weld last on metal?

JB Weld needs to be mixed and applied correctly to last long on any material. In general, the glue can last for up to 2 years on metal in optimal conditions.

Here are some tips to ensure JB glue lasts long on metal: 

  • The metal surface has to be properly cleaned and free from substances such as oil, dirt, or grease.
  • It should not be exposed to extreme temperatures often.
  • The object should be kept away from any chemical that may result in corrosion of the metal.
  • The level of stress on the metal should be within capacity to avoid separation.

Strongest JB Weld for Metal

The most suitable JB weld for metal is the JB weld steekstik steel reinforced epoxy putty.

This glue has been specially made to join different metal surfaces together.  It can be used for projects involving copper, steel, aluminum, etc.

The product comes in different forms – a tube, an applicator, or a syringe bottle.

How strong is JB Weld on aluminum? 

JB Weld produces a very strong bond on aluminum. In fact, the tensile strength reaches up to 5020 PSI. You can get a similar result on other metal surfaces except for lead.

For the best results, the application process is very important. Ensure you follow the instructions to the latter. The items to be joined need to be clamped together and unmoved throughout the time it cures.

JB Weld typically cures in 24 hours on aluminum. Always refer to the product packaging for more info on the curing time and application method. 

How long can JB Weld hold?

For all the types of JB weld, optimum performance will depend on proper preparation and application technique.

It is very important to follow the manufacturer’s information while using these formulations.

JB weld has a shelf life of 1 year before it starts to lose its adhesive properties. For good performance, it is important to store this glue in a cool and dry environment.

Its longevity and curing time will depend on the formulation type used.

Typically, JB weld can hold anywhere from a few months to 2 years.

Is JB Weld as strong as a real Weld?

No, it’s not! While JB weld produces a tough bond, it is not as durable as a traditional weld. 

A traditional weld involves the melting of the two surfaces together, which occurs at a molecular level. So, the bond is usually impeccable; it’s almost as if you’re joining two materials to become one. 

JB Weld, on the other hand, is an adhesive and merely holds the two surfaces together, though very tightly

What Will JB Weld Not Stick to?

Despite its renowned strength, there are certain surfaces JB weld doesn’t stick well to. Some of these are:

  • Polyethylene
  • Polypropylene 
  • Rubber
  • Silicone.

If you intend to use JB weld on a particular surface, you need to ensure that the surface is clean. The presence of oil, loose paint, or grease can greatly reduce the bond strength. 

Substances that are soapy or slippery are also not ideal for this glue. These substances are often used to even take it off surfaces.

If you get JB weld on your hands, wiping with warm soap and water is often efficient in removing it from your hands.

Other substances that can be used are acetone or acetone-based products.

Other Related Questions

Is JB Weld a permanent fix?

JB weld provides a long-lasting solution, but it should not be considered a permanent fix. You may need to reapply the glue or replace it periodically to maintain the integrity of the bond. 

Does JB Weld hold steel?

Yes, JB weld is known to hold steel. The JB Steelstik is specifically formulated for steel and other metal surfaces. You can also use other types of JB weld.

Is JB Weld stronger than steel?

While JB weld can provide a strong bond between steel surfaces, it cannot surpass the strength of steel. Steel is highly durable and much stronger than JB weld.

How long will JB Weld last?

JB weld can last up to a year before it begins to lose its efficacy. Sometimes it can last up to two years or even more when fully cured. In general, the longevity of JB glue greatly depends on the type and the amount of time you allow it to cure. 

What is stronger than JB Weld?

While JB Weld provides a very strong bond, there are still a few products that perform better than it in certain situations. Also, techniques such as welding, brazing, and the use of structural adhesive will always produce a stronger bond when correctly implemented.