Does JB Weld Work on Aluminum? (7 Facts To Know)

JB Weld is a pretty popular adhesive used to bond a wide variety of materials. If you’ve never used it before, you may be wondering if it sticks on aluminum. 

In this post, we will examine how effective JB weld is for metal applications, specifically aluminum. I will also be showing you some of the best options available if you do decide to use it for aluminum.

Does JB Weld Work on Aluminum?

Yes, JB Weld does work on aluminum. When applied correctly, it can provide a strong and durable bond on aluminum surfaces. However, achieving a strong bond with aluminum requires proper surface preparation and applying the glue correctly.  

Is JB Weld Permanent on Aluminum?

JB Weld provides a very strong and durable bond on aluminum, but the permanence really depends on a number of factors. This includes changes in temperature, exposure to moisture, and mechanical stress on the bond. 

While the glue may be considered a long-lasting solution, it’s recommended to inspect it occasionally to ensure continued performance.

JB Weld Aluminum Strength

The strength of JB Weld on aluminum surfaces is quite impressive and is often able to withstand significant stress and pressure. Several tests carried out in the past showed that the tensile strength of the glue can reach up to 5020 PSI. Now, that’s a lot! 

If you want your project to be as strong, then you’ll need to wait for the epoxy to cure fully, ideally overnight. 

Other factors that may impact the strength include surface preparation, type of JB weld used, and the nature of the load or stress the bonded aluminum will be subjected to.

What is the Best JB Weld for Aluminum? 

Here are three products I highly recommend for working on aluminum:

JB Weld Original Cold Weld Formula

The classic JB Weld Original Cold Weld Formula is a good option for bonding aluminum. But it works for other surfaces such as wood, metal, and even plastic. Under normal conditions, the glue sets in under 6 hours and cures fully within a day. Once fully cured, it has a dark grey color and can be sanded, molded, or filled. The product works well for general repairs and has a tensile strength of around 3,960 PSI when fully cured.

JB Weld 8276 KwikWeld

While not specifically designed for aluminum, this quick-setting epoxy can also provide excellent results on aluminum surfaces. It sets in about 6 minutes and achieves full cure within 4-6 hours. With a tensile strength of 2,425 PSI, it offers a reliable bond for various applications.

JB Weld 8280 Original Epoxy

This professional-grade epoxy is another suitable option for aluminum bonding. With a set time of 4-6 hours and full cure achieved in 15-24 hours, it offers a robust bond with a tensile strength of 3,960 PSI.

How to Use JB Weld on Aluminum

• Surface Preparation: Before anything else, you want to prepare the aluminum surface to be joined. Dirt or oil on the surface can interact with the glue and reduce the strength. So, before you start, make sure the surface is clean. You can use a degreaser for this purpose. A little sanding may also help with adhesion, but this is not a must. 
• Mixing the Epoxy: Follow the instructions on the JB Weld product for proper mixing ratios. Thoroughly mix the epoxy components until you achieve a uniform color.
• Application: Apply the mixed epoxy to the aluminum surface, ensuring an even and consistent layer. For the best results, slightly overfill the gap or area being repaired.
• Clamping (if required): If the repair involves two separate pieces of aluminum, use clamps to hold them in place while the epoxy cures. Alternatively, use weights or other suitable methods to keep the pieces pressed together.
• Curing: Allow the JB Weld to cure according to the product’s instructions. Keep the bonded aluminum in a stable environment with minimal movement during the curing process.

How Long Does It Take for J-B Weld Aluminum to Cure?

Like other glue manufacturers, JB weld usually have the drying time written on the label. This allows you to know how long to allocate for the project. 

The drying may slightly differ depending on the specific product. In general, the glue typically sets in 4-6 hours, while full curing is usually reached in 15-24 hours. 

It’s important to wait for the glue to completely dry; otherwise, the strength will be compromised. 

The drying time might be prolonged if humidity is low, so always do a rain check before using the adhesive. 

Will JB Weld Work on Aluminum Oil Pan?

JB Weld will work on an aluminum oil pan, provided the crack is not too much. It’s best used for small cracks or leaks. 

The curing time is critical to ensure the bond is strong. You want to give enough time for the glue to fully cure before you use the pan. We recommend waiting at least 24 hours. 

For the best results, ensure the cracked area is free of dirt and oil before applying the adhesive. 

Will JB Weld Work on Aluminum Radiator?

Yes, JB Weld can be used to repair minor leaks or small cracks in an aluminum radiator. 

Radiators are essential components of a vehicle’s cooling system, and any leakage can lead to overheating and engine damage. If the leak is significant or in a critical area, it is recommended to replace the radiator or call a mechanic. 

However, for small leaks or cracks, JB Weld following can provide a temporary fix but you need to follow the manufacturer’s instructions. 

Can You Use JB Weld on Aluminum Bike Frame?

Using JB Weld on your aluminum bike frame is not the best move. This is because the frame bears a lot of weight, which makes a glue less effective for repairing cracks on it. 

Not only glue but also traditional welding is not recommended because aluminum tends to lose its strength after welding, unlike other metals like steel. 

To be on the safe side, it’s best to get a new bike frame, especially if the damage is large. 

What is the Strongest Epoxy for Aluminum?

While JB Weld is a popular choice, there are other high-strength epoxy alternatives that may offer even stronger bonds on aluminum surfaces. Let’s look at them. 

Loctite Epoxy Weld Bonding Compound

Loctite offers a high-strength epoxy specifically formulated for metal bonding, including aluminum. It provides a durable bond with excellent resistance to temperature fluctuations and is more flexible than traditional JB Weld. On average, it has a tensile strength of 3500 PSI, which makes it one of the strongest alternatives to JB Weld for aluminum applications.

Permatex 84109 PermaPoxy Epoxy

This epoxy adhesive is designed to bond various metals, including aluminum, within a short period. It sets in about 4 minutes and cures quickly to provide a reliable bond. While not as strong as Loctite’s epoxy, it still offers a tensile strength of around 2,500 PSI, making it suitable for medium-stress applications.

3M Scotch-Weld Epoxy Adhesive

3M is a well-known brand for adhesive solutions, and their Scotch-Weld DP420 epoxy adhesive is no exception. It is formulated for bonding metals, and its flexible nature allows it to handle varying degrees of thermal expansion and contraction. This epoxy offers a tensile strength of approximately 4,000 PSI, making it the strongest alternative to JB Weld for aluminum bonding.

How Do You Get Epoxy to Stick to Aluminum?

Achieving a strong bond between epoxy and aluminum requires proper surface preparation. Follow these steps to ensure good adhesion:

1. Clean the Surface: Start by cleaning the aluminum surface using a degreaser or solvent. This will help get rid of any dirt or grease on the surface and also promote adhesion.
2. Sand the Surface: Lightly sand the aluminum surface to create a slightly rough texture. This helps the epoxy adhere better to the metal.
3. Remove Oxidation: Aluminum can form a thin layer of oxidation, which can inhibit adhesion. Use a suitable aluminum cleaner or a mild acid to remove the oxidation before applying the epoxy.
4. Mix Epoxy Properly: Follow the manufacturer’s instructions to mix the epoxy adhesive thoroughly. Proper mixing ensures the epoxy cures correctly and develops its full strength.
5. Apply Evenly: Apply the mixed epoxy to the prepared aluminum surface, making sure to spread it evenly and cover the entire bonding area.
6. Clamp or Hold in Place: Depending on the application, use clamps or other methods to hold the aluminum pieces in place while the epoxy cures. This ensures a tight bond and prevents any movement during the curing process.

Summary: Does JB Weld Work On Aluminum?

In conclusion, JB Weld provides a strong and durable bond in aluminum when used correctly. However, you need to prepare the surface properly and use the right JB Weld product. More importantly, pay attention to the curing time.

For specific aluminum repairs, such as oil pans and radiators, JB Weld can serve as a temporary solution for minor leaks or cracks. Still, it’s important to assess the extent of the damage and consider professional repairs or replacements for critical components.