The other day I had to fix a plastic drainage spout on my portable air conditioner. I used the two-stage LePage plastics glue from Home Depot and it worked surprisingly well. The seal was even water tight.
Basically, it comes with a pen applicator that acts as a "primer" and then you use the cement from the smaller tube.
So far I have had good luck with automotive epoxy. Though the applicator gun is expensive and I am not sure of the epoxy's limits yet.
I never had any luck with JBWeld at all. But that may have just been extreme unreasonable situations.
Just use the two part epoxy you mix up. You don't have to use the best epoxy out there, dollarama epoxy works fine. Use a little bit more to fill in gaps/provide support. Don't get any epoxy on circuit boards.
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