So the blue stuff on the threads is called Nylok. It is not Loctite. Unfortunately, Nylok is only sold to manufacturers, not the general public.
That being said, Loctite works good too ... But use the correct Loctite based on your thread diameter. Blue Loctite is medium strength and recommended for 1/4-3/4" fasteners. Purple Loctite is low strength and recommended for fasteners smaller that 1/4". Do not use the Red Loctite as that takes heat to break the bond.
PS ... I like the Loctite in gel form instead of the liquid.