CRK ships the newer models with it, so I reckon they suggest it's use; not sure why this is a question. I use a small dab on the pivots, once I get them just right. The only part of a CRK that has ever actually loosened on one of mine was the stop pin screw on a 21, I used the purple on that and never had an issue afterward.
I believe that the titanium and the hardware "galls" together to a degree so that on the older models it wasn't typically an issue.