Re: What kind of epoxy is best for potting pickups?
Well at that point you're not really potting anything, you're just glueing the cover on. The purpose of potting with something thinner (like a thin flowing epoxy or hot wax) is to get it to fill all the hollow air gaps. You can't do that with JB Weld or Liquid Nails. Not challenging the almighty Odie on his recommendation, just saying that if you feel you've lost some of the potting integrity on the magnet and other parts of the assembly during hybriding, the JBW/LN won't "re-pot" anything. I would use something that could be removed easily, like wax, in case you decide to swap pups at some point. Possibly a caulking material that would peel off. Or you could wrap the pickup in plastic wrap, do your JBW/LN "potting" to fill in the cover all around, and then take the pup out, take the plastic off, and re-insert it with wax potting so that you aren't filling up the whole thing with wax, just the immediate perimiter.
Edit: Thanks for verifying your crappy idea was just a joke, Dave!:laugh2: Although I still stick behind my idea of Liquid Nails-ing the overall size of the pickup to fill it in, then wax potting the interior.