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Has anyone found any adhesives that seem to make a good bond with nylon? I sometimes have parts with holes I would like to have with a tighter fit without using oversized fasteners. I haven't tried JB Weld or Plastic Welder yet, but would like to hear some experiences before I start testing.

If its a 4-40 hole, I'll step up to M3. After that, I'll use a Helicoil or brass insert.

For 8-32, I go directly to the coil or insert.


I've tried tapping holes filled with CA, it didn't want to hold.

Cyanoacrylate glue or crazy glue, is about the best for most nylon joints. It's not as flexible so it needs to be a secure connection. It works very well for repairs where something has snapped but not stretched. Rough surface is helpful also.

Tapping a hole filled with CA is not good because the act of forming the threads will tear it out.

For thread repair, I'll place a drop of CA in the hole, and a drop of oil on the threads of the screw, then fasten like normal. The oil on the threads prevents the glue from full attaching to the screw., Which allows you to remove at some point in the future.

As for trying to shim up hinge pin holes with some kind of glue, that tiny gap is very hard to fill with something that will stick. For that type of application, it's better to open up to 9/32" and use brass tubing with 1/8" Id.

I don't have experience with using this stuff on nylon, but i was the only thing I could get to bond an old plastic TRC Stealth antenna that was broken in two. I tried a few glues and two-part epoxies, but nothing worked except the Plastic Bonder.

https://www.loctiteproducts.com/en/products/build/epoxies/loctite_plasticbonder.html