Blue loctite (242, 243) isn't heat-resistant and is only a Placebo in this application.
242 requires heat in excess of 482 F to release where hand tools do not work per their TDS. If you're letting your barrel get that hot, you must have stock in Bartlein...
I use Rocksett where I have less than what I normally consider to be adequate torque shoulder on the barrel. Threads bring the parts together- shoulders align them. If I have concern about deforming the shoulder from torque, I'll use Rocksett to be sure the alignment is maintained and the muzzle device can't vibrate loose.
Perfectly faced shoulders on the brake and barrel shoulder will "hold" extremely well. Anyone here who's installed them knows you can "wring" a brake onto the shoulder with your fingertips- and you'll need a wrench to get it off. All that said, I put a drop of 242 on my own because it can't hurt...
JMOYMMV.
