Originally Posted by
garage sale GT
Threadlocking adhesive; should be available at hardware stores. I have never used it on presta valve cores. You simply put it on the threads and assemble the part.
There's no need for a thread locker. these valves have been proven reliable for over 3 decades. The OP should just screw it in tightly and forget about it. To the OP, you'll note that though GS/GT mentioned threadlockers, he does the opposite using a dab of oil.