There appear to be different levels of permanence of threadlock - Loctite being one of the brands presenting themselves.
Generally BLUE is good, but the WEAKEST, for holding, but things you wish to remove and replace - nuts, certain access bolts, grub screws, etc. Most of the time, this can be replaced 'with a firm hand'. Head / hammer may be required on some occasions.
RED, is much more 'permanent', and heat / hammer is probably a must if you wish to remove the part.
GREEN I've seen as a 'next stage' and is pretty much 'welded in'.
There's a thread where other members of the Forum actually work with this stuff and have better clarified.
Certain manufacturers have CROSSED the red and blue, perhaps to deliberately confuse, for marketing, perhaps who knows, so ask questions before purchase.
ONE GOLDEN RULE: Once used, leave at least overnight to 'cure' before using the rig, or it will have little effect.
Al.
