I do not use Locktite or other such products. I hand tighten and when then put a dab of clear finger nail polish on the top of the screw head. As already mentioned, if you romp down on the mounting screw, you are very likely to strip the threads.

A "hard stop" hand tight with just a scunch more is plenty firm. This method has worked great for me for many, many years. I have never hand any back out. To loosen, just a dab of polish remover softens the dried polish and backing out is simple.