I use blue Loctite when I want thread locker on small parts (i.e. models), however on parts I'm nervous about (concerning eventual disassembly), I use the HPI crap. It works, but doesn't make removal difficult. And I do use it on crankshaft-clutch retaining screws if that's what you're talking about.
http://www3.towerhobbies.com/cgi-bin...?&I=LXDHK5&P=7