Over time you will realize what needs to be threadlocked and what doesn't. On my mugen, the post that hold the wing mount together, the servo saver shafts the pipe hanger and grub screws holding my cvd's. that is it.
I never put them on my engine mounting screws, that get PLENTY tight enough. And you only need a VERY small amount. I have had the same little losi bottle for 2 years and it is still only half empty. One very small drop and dab the excess on a rag or shake it off.
And NEVER i mean NEVER put it on the end of a crankshaft.