I used red 242 loctite on my old Italian frames, but I found it aggravated the problem because the loctite is chalky when it cures and as it breaks it becomes a powder that reduces the friction the threads provide to hold the bb in. I did use the blue 262 in small dabs on the thread to prevent a loosening problem I was having- removal wasn't that hard either; just needed a good tool, good leverage and a firm snap to it. Make sure the threads are completely clean 1st.
Now, I must qualify this by saying I never had a BB seize up on me though I never used exotic materials, so my experience might not apply there.