I'm replacing one sealed cartridge bottom bracket with another (Shimano UN-52 with a BB-6500) in a steel frame shell. Working from the Park website I removed the UN-52. Before installing the new bb they recommend (in this order) preparing the shell threads with:
1. a thread locker if "the frame shell is steel and the cups are either aluminum or steel lockrings"
2. grease or anti-seize compound
The BB-6500 has an aluminum lockring. I've never heard of a thread locker or asc. I checked the prices and found:
0.33oz (10ml) of Loctite 242 (the mentioned thread locker) is more than $10
4oz (120ml) of Park ASC-1 is about $10
3oz tube of Phil Wood waterproof grease is about $4.
I don't know how much gets used when applying it but 10ml of loctite sounds like it would do just one installation.

Are the other products that much better than grease?
Are they necessary if you avoid riding in the rain (but do get caught occasionally)?
Thanks