I would not use Loctite on them if you ever want to get them off. To remove something with red Loctite, it often requires heat. With the blue loctite it requires a lot of torque. When I mounted my towing baseplates to my Jeep Wrangler, on the driver's side, you use the bolts that hold on the steering gear box. The factory used blue loctite on them. My impact wrench, a very high torqe IR model wouldn't do it. I had to use a 1/2" x 18" breaker bar with a cheater pipe to get them out. I realize there's a differance between your valve stems and my steering bolts, but I think if you use Loctite on them, you'll ruin either them or the air monitors when you have to remove one. If you have problems getting them to seal, I'd use just a touch of noon-hardening pipe dope on them.
Bill
