How to Use J-B Weld on Plastic Parts

Written by dale yalanovsky
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How to Use J-B Weld on Plastic Parts
J-B Weld only works on PVC plastic. (te en pvc 45° image by Marie-Thérèse GUIHAL from

J-B Weld offers many products, but all of them are some type of adhesive or cold weld product except for their radiator sealant, which doesn't concern us here. Known throughout the industry as the finest bonding agent made, even J-B Weld has its limitations. It will not adhere to either polythene, polypropylene or the plastics in that same chemical family. Essentially, common everyday plastics, such as bottles, toys, plastic bags, microwaveable plastics and the like, are not compatible with any J-B Weld formula. The only plastic that is applicable for J-B Weld products, are PVC plastics and their derivatives.

Skill level:

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Things you need

  • PVC plastic
  • J-B Weld

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  1. 1

    Mix two-part J-B Weld together. It is essentially a two-part epoxy that will come in two separate tubes. The "steel" compound gets mixed together with an equal part of the "hardener" compound. A supplied mixing stick aids in this process. The J-B Stick Weld will need to be cut into an appropriate size and kneaded together between fingers to activate the hardening process..

  2. 2

    To repair a crack in a PVC plastic, spread either compound over the top and allow to dry approximately 15 hours, or overnight.

  3. 3

    To repair a separated piece, spread J-B Weld between the separated pieces of the plastic and join the two pieces together. Spread some more over the top to cover the seam, and once again, allow to dry 15 hours, or overnight.

Tips and warnings

  • J-B Weld can be painted when dry to match the colour of your PVC plastic.

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