Bolts tightened to the proper torque value do not need any sort of locking device, liquid or mechanical. That being said, LocTite is good insurance. The trick when using any type of liquid threadlocker is getting both surfaces clean. Even a slight film of oil will prevent the threadlocker from getting a bite on the pores of the metal.
Threadlock compounds are known as "anaerobic sealers", as they harden when out of the presence of air. As long as Loctite is exposed to air, it stays liquid. Once it's trapped in a thread it hardens. The red stuff needs heat to release it, about 400 degrees F., while the blue, green, or purple color usually responds to a firm pull and shears off without the benefit of heat. Those sheet metal lock tabs are just "feel good" devices which will not prevent an improperly tightened bolt from backing out anyway. Use the red loctite, and be sure to get the threads chemically clean, then torque them to spec and forget about them!
Jerry
