Alright, I'm used to using locktite while working on my car that I drive everyday, but my question is this. What type of locktite should I be using or rather, what strength? I was thinking that the blue (medium) strength locktite might be a bit to much considering that I am using them on machine screws, some with philips heads and others with alan heads. I thought that the purple (light strength) might be best. Let me know what ya'll have been using. Thanks