Loctite, is the brand of glues owned by Henkel.
Loctite 249 is the threadlock, which as above is used for locking bolts and nuts.
Metal to metal.
The threadlock is a red tube, what colour is the liquid? Blue or red
Blue is the medium strengh so can be undone with normal tools.
Red is the hig strengh, its alot stronger than the medium.
I used to sell it on here and other places.
Gav