I, too, Folks,..
...have used JBWeld with success, even more than the "Fluid Weld" I suggested in the VirtualIndian discussion (http://virtualindian.org/11techleaktest.html
However, I found it needed to cure a couple of weeks at least to withstand my immersion tests.
I'm not familiar with those particular Loctite numbers, but I had a horrible failure on a WLA nipple with green Retaining Compound 35: I won't trust anything that tastes like saccharin around today's pump gas. And you can damn well bet fuel gets there!
I won't trust any threads anywhere to seal (except tapered pipe theads, of course.)
The nipple shoulder is supposed to seal butted against the casting, and the rivet by expansion when "upset". Rivets seal easiest with a tapered head on the inside, allowing for a much more authentic appearance on the outside with just a straight smack of the hammer (no over-peening necessary), provided the rivet is a slip-fit in its hole.