Does J-B Weld Work On Aluminum?

• Post By: Brandon M. Fox  • Updated: 06/15/22
• JB Weld

If you have ever tried using J-B Weld, then you would know how effective it is as a bonding agent. J-B Weld just might be your solution when you cannot afford to hire a professional welder as it works on most surfaces and is very DIY-friendly.

In this article, you will find out whether J-B Weld works on aluminum or not; and if it does, how do you make it so?

Read on to learn more.

Related: Does Jb Weld Work On Cast Iron?

Does J-B Weld Work on Aluminum?

Yes, J-B Weld works on aluminum. This two-part epoxy of J-B Weld creates a strong adhesion between two or more metal pieces. Except for lead, J-B Weld can work on any metallic surface. The J-B Weld Company has been doing business for over 50 years with its original product line including this two-part epoxy.

This epoxy does a better job on minor repairs than those that require more extensive repairs. This is because minor repairs require a more straightforward use of the two-part epoxy compared to the more complex application process on major repairs.

Based on actual reviews of J-B Weld, reviewers affirm the effectivity of J-B Weld on aluminum, and the strong bond that lasts years. They are pleased with the ease of use of the product and its excellent results.

How Effective is J-B Weld on Aluminum?

Actual users of J-B Weld stated that if you could follow the instructions to a T and have the pieces clamped together and unmoved for the entire curing process, then you are highly likely to get the best results.

It is important to keep in mind that although the product might be highly effective, there are still cases where it might not adhere to the surfaces as good as you thought it would. For instance, when repairing the same broken part for the third time, the adhesion might not be as firm as it did the first time around.

How Can You Use J-B-Weld on Aluminum?



Knowing how to use J-B Weld is very important in achieving best results. First, clean the pieces of aluminum you wish to bond by removing any rust, dirt, paint, or other contaminants on its surface. If there is leftover oil or grease on the surface, use a solvent to remove it.

Before applying the epoxy, you may need to score the aluminum; and this can be done with a good wire brush.

Next, mix the two parts of the epoxy in a 1 to 1 ratio.

If you start to notice any heat from the mixture, you may now proceed with applying the epoxy to your aluminum pieces. Clamp them together securely so that it does not move until the curing process is over. For best results, let it sit for a day.

Tip: The product packaging also includes a step-by-step instruction which you can follow.

What J-B Weld is best for aluminum

The best J-B Weld product for aluminum is the one created for use in boats because they control callous conditions and must stay strong. We have the two strongest J-B Welds below, these are-

1. J-B Weld 8271 KwikWeld Professional Size

The fast-setting version of the original J-B Weld two-part epoxy cold weld system is KwikWeld. This can give you powerful and long-lasting repairs on different types of surfaces. Full cure time for this is 4-6 hours, and set up time is 6 min. After mixing, you will get a permanent bond.

2. Star Brite 4 Oz Epoxy Putty Stick

This is especially designed to work underwater. It can be used for emergency and permanent repairs on board. It is also very easy to use and the cure time is 60 minutes and can make bonds is 5-10 min. On weathered aluminum, oxidation and anodization help maximize bonding.

Is J-B Weld strong on aluminum?

Of course, aluminum is excellent for aluminum welding, but J-B Weld also can do the job well. According to scientific tests, the approximate tensile strength for J-B Weld is about 5020 psi. To achieve that, allow the epoxy to cure overnight if you want to reach that level of strength.

J-B Weld aluminum cure time

The product packaging includes the setup and cure time. For J-B Weld, the cure time is 15 to 24 hours and the set up time is 4 to 6 hours. 

Before testing the repair, wait until the cure time is over. You will be able to find many products with little cure time, but they are not strong as J-B weld.

Final words

Now that you have learned how J-B Weld works on aluminum and how effective it is on this type of material, it is important to follow the stated procedures regarding its application as well as the cure time to achieve the results you want.

Related post

  1. How To Remove JB Weld?
  2. Why JB Water Weld Not Hardening?
  3. Quick Guide: Where Does JB Weld Work On?
  4. What To Look For In Water Weld?
  5. Jb Weld Cure Time vs Temperature
  6. Will JB Weld Work On Plastic?
  7. Flex Seal Vs JB Weld

Brandon M. Fox

I have completed Diploma at Welding. I have spent 10+ years in Welding. Now love to write about welding and welding products and share my own experiences. Find me: Twitter | Facebook

Keep Reading