What's a good adhesive or epoxy for adhering to metal that can be drilled and tapped?
I've got a 1/4" copper fitting. I'm looking for a non-conductive adhesive to fill it up halfway, drill and tap it so a spark plug can screw into the end. I was trying to find a nut earlier that would screw onto the end of a spark plug with an o-ring, no luck at the hardware store. I'll probably do the same thing with a few larger sized nuts: fill, drill, tap. And I'm just looking for a decently priced multi-purpose adhesive (non-conductive). And I will be needing a conductive one fairly soon. JBweld seems to be popular in some groups. I don't know if it's non-conductive.
It would also be nice if it could adhere to pvc, too. :-)