Materials

Instant Adhesive Welding Powder Kit

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Repair breaks, cracks, holes and gaps

I originally saw this product ($14) (or an equivalent) being demonstrated at a woodworking tool show. It looked like a gimmick but the demonstrator was able to make a butt joint (tee) between two pieces of thin plastic with this system that I could not tear apart. He used the powder to create a fillet along the joint and this extra surface area dramatically increased the strength. As far as I can tell, the kit is a thin cyanoacrylate (CA) glue and the welding powder is fine glass beads. You put down a line of the powder along the joint and then drip on the glue. Basically it wicks into the powder and sets in a few seconds to a rock hard consistency. You can repeat this and actually build up to replace a tab or part that has snapped off as well as repairing. The final product can be filed or sanded and it is really tough.

Where this excels is in fixing cracks in thin plastic or metal where there would not be enough surface area for conventional glue to hold. I have used this for all sort of toys and gadget repair. It is not a universal solution, but for certain applications, I have not found a substitute. I have seen some comments on Amazon that baking soda will work just as well, but I think the baking soda just causes rapid polymerization without giving the mechanical strength of the glass/ceramic fill.

A couple of caveats:

  • This does not make a beautiful repair. The glass powder creates a lump along the seam a bit like a real weld. For some applications it doesn’t matter or you can hide this on the inner surface, but you are not getting a museum quality repair on the Ming vase.
  • There are no safety warnings on the brand that I bought, but it seems prudent to be careful with the glass powder so you don’t get it (or the glue obviously) in your eyes.
-- Jon Margolis 10/25/18

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