How to Glue Steel With J-B Weld
With a tensile strength of 3,960 psi, J-B Weld is a structural adhesive, meaning that it makes permanent repairs that are as strong as the material it bonds. Its ingredients include epoxy adhesive mixed with fine particles of iron and steel. J-B Weld consists of two parts; either part washes off your hands and tools easily. When cured, J-B Weld withstands temperatures of over 500 degrees Fahrenheit (300 degrees Celsius), making it a suitable material for repairing engines and other moving steel parts that generate heat. It isn't suitable, though, for super-hot applications, such as automobile exhausts.
Clean the surfaces you intend to bond thoroughly to remove grease and fine dust. The most effective way to do this is to wash the surfaces with a strong solvent, such as acetone or lacquer thinner.
Roughen the surfaces with sandpaper or by scoring them with a sharp knife. This increases the bond strength of the adhesive.
Deposit equal amounts of J-B Weld epoxy and hardener on a disposable sheet of cardboard. Mix them together with a thin plastic spatula or the tip of a utility knife blade. Stir thoroughly until the mixture is a uniform gray color.
Apply the epoxy to one of the surfaces being bonded and join the pieces. If you're patching a crack, fill the crack with the adhesive.
Clamp the pieces you are joining with clamps and leave them undisturbed for four to six hours. Similarly, if you filled a crack, leave it undisturbed for the same amount of time.
Allow the adhesive to cure for 24 hours before subjecting the repair to strain.
Things You Will Need
- Acetone or lacquer thinner
- Utility knife
- Plastic spatula
- Heat helps the adhesive cure more quickly. If time is an issue, you can use J-B Weld KwikWeld. It sets in six minutes and cures in four to six hours, but its tensile strength is only 2,424 psi.
- J-B Weld bonds metal, ceramic and rigid plastics. It won't bond flexible materials, such as leather, vinyl, canvas or flexible plastics.