I have used Tuf-Glide in the past on other folding knives with good results and many knife owners swear by it. I have not used it on the RSK series myself. It claims similar properties to Militec-1. I am not familiar with MD Labs XF7, but I'd be inclined to think that a "grease" might be difficult to apply to the joint without disassembling the knife, which would void the warranty.