jb weld review

How strong is J-B Weld? It is extremely strong. J-B Weld is arguably the strongest bond in the world. It is your best bet when it is difficult to weld two surfaces together. It is the alternative to soldering, welding and brazing.

It provides a permanent bond and lasting repairs to metal and other surfaces. It can be shaped, filed, sanded, drilled and tapped. J-B Weld has a high tensile strength of 5200 PSI. When fully cured, it can withstand a temperature of up to 5500 degrees Fahrenheit.

The adhesive sets to a hard bond overnight. It is as strong as steel. Full cure is just in about 16 to 24 hours. Set time is between 4 to 6 hours. It dries in a dark grey colour. 

How to Use J-B Weld 

  1. Prepare – Clean the surface area of grease, oil, dirt, paint or any loose debris. For best results, it is advisable to use degreaser or detergent to clean the surface. Try to roughen the surface with sandpaper to give you the best repair. 
  2. Squeeze out an equal amount of solution from the two tubes. Mix it on a disposable surface and mix thoroughly 
  3. Apply to the surface using the right tool in an even coat. 
  4. Dry time – It sets in 4-6 hours. Curing time is in 15-24 hours. Wait for at least 15 hours before putting the object in use. 

How Strong is J-B Weld on Aluminium?

J-B Weld is a two-way epoxy glue that is designed as an alternative to torch welding. It is strong on aluminium and other metal surfaces. It does not work on lead material, flexible rubber, leather, vinyl, canvass, polypropylene and polyethene plastics. It sets faster than most of the glues out there. The adhesive will never run sag before it sets up.

One good thing about it is that it can withstand a lot of heat. Cleaning and prepping the surface is the hardest part of it. You have to sand the aluminium just before you apply the epoxy. This helps to ensure that the oxide layer is off. After sanding, try to prevent air from gaining access into the aluminium. Once that is done properly, you are in for a durable and long-lasting bond that will serve you for many years to come.

After the epoxy repair, you will need to wash and dry with a clean paper towel. Also, use a solvent to ensure there are no residues left. It is advised to use a lot of glue for a wide area. The wider the area, the more glue needed.

This will guarantee a permanent bond no matter the aluminium surface that you are trying to glue. Use the regular setting when applying the glue. J-B Weld is the best glue you can use for any aluminium applications.

This is amazing stuff. It holds well on aluminium pipes, intercooler, sink drain and other aluminium metal. The glue is super easy to use. They come in two big size tubes. These two tubes will do a lot of repairs. 

How Strong is J-B Weld on Plastic

J-B Weld is designed to adhere to most hard plastics. It does not only glue to plastics, but it also works for other materials such as fibreglass, PVC, ABS glass, vinyl and most plastics. It sets in 5 minutes and cures in 1 hour.

This makes J-B Weld is a multi-purpose glue. It has a high strength of 4400 PSI and dries in an off-white colour. The glue bonds instantly with superior strength. There is no shrinking and the glue is easy to sand, drill, paint or saw after curing. This solution is hand-mixable. J-B Weld is a fast setting epoxy glue.

It forms a polymer compound that can be moulded easily. After its application, the glued surface can be used to build up or repair just about anything that is made from plastic. J-B Weld is not designed for some plastics such as polyethene, polypropylene and some other plastics.

If you are looking for J-B Weld glue that bonds polypropylene and polyethene plastics, you had better go for the J-B Weld Plastic Bonder. The company makes different products that are suited to different plastic applications. 

How to Use J-B Weld on Plastic 

  • Preparing the repair site – When you are using J-B Weld on plastic, it is important to clear the surface of grease, oils and residues. Surface cleaning is critical for a permanent bond of plastic to plastic or plastic to other materials. Ensure that the area you want to bond is well wiped with rubbing alcohol or vinegar. Using alcohol or vinegar helps to remove greasy films that were not noticeable when cleaning the surface. If you are bonding two smooth surfaces together, use medium-grit sandpaper to roughen the surface and wipe away the residue with a paper towel. 
  • Applying J-B Weld – After prepping the surfaces to be bonded, preparing the J-B Weld is the next thing to do. The product comes in two tubes. Mixing the two gives you a very strong epoxy. Press out an equal amount of the contents from the two tubes on a disposable material or paper plate. Squeeze out as much as you can. Mix the substances with a toothpick or nail until it is thoroughly mixed. Apply the mixture to the two surfaces that you wish to bond and press hard on the materials for a solid bond. Clamp the bonded items as J-B Weld cures. Normally, clamping methods will vary depending on the materials being bonded. A heavyweight object will be right for clamping if the bonded items are of a flat shape. Another way to clamp is to use a vice or use rubber bands to hold the bonded materials together. 
  • J-B Weld Curing Time – Though J-B Weld sets in 4 to 6 hours, the curing time takes about 15 to 24 hours. Do not use the bonded items until at least after 16 hours. If you want a faster setting time, you can go for KwikWeld but it is not as strong and durable as the Original J-B Weld. 

J-B Weld is not Meant for Some Certain Plastics 

J-B Weld does not adhere well on polyethene and polypropylene plastics. In most cases, these types of plastics are identified with their recycling code. For instance, when you see a triangle with 1, 2 or 4 on it, it indicates a kind of polypropylene material. But when you see 5, it is polyethene.

In some cases, letters are used instead of numbers and triangles. When you see PET, HDPE, PETE, LDPE and PE, all of these letters indicate polyethene and when you see PP, it indicates polypropylene.

These recycling codes are usually seen on the bottoms of plastic items such as laundry detergents or containers for food. Polyethene is usually used for gas and water containers or garden sprayers. Polypropylene is a harder plastic than polyethene. 

Between J-B Weld PlasticWeld and WaterWeld

J-B Weld offers some products that bond more types of plastics than the original J-B Weld. PlasticWeld can be found in both two-part liquid epoxy and epoxy putty form.

None of these products bond polyethene and polypropylene plastics but they are durable than the original J-B Weld. The liquid version cures in one hour while the putty version cures in three hours.WaterWeld is another plastic glue that is made by J-B Weld.

This glue is perfect for PVC pipes or in situations where plastic parts are wet or will get wet. WaterWeld cures in one hour and sets in 15 minutes.


There is no doubt JB-Weld is the world’s strongest adhesives. If you want a permanent bond without the need for welding and soldering, JB-Weld is the best solution.

fter curing, the epoxy can be sanded, painted, filled and tapped. Some of the adhesives require no clamping. Choosing JB-Weld is a wise choice over other brands.

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