As most of you may surmise, or already actually know, this topic has been discussed nearly to death.
Here is the problem with using Tuf-Glide as a lube. It is first and foremost a Thin Film Corrosion Inhibitor. Made for preventing corrosion, got it? Now, it does have slight lubricating properties, and some people have successfully used it on the pivot point of their folders. However, a lot of people (especially Sebenzanistas) have tried it for this purpose, and ended up with a sticky liner lock or frame lock. There is a reason that Sentry makes a heavy duty lube called Hi-Slip Grease. It is my guess from the color that it is a MoS2 product. It works well, but suffers from the same problem all MoS2 products have: it is black, and gets everywhere. If you have a difficult lube problem, however, there is nothing like it. My old Gold Cup, shooting mouse pressure loads with a reduced power recoil spring, will only work reliably with MoS2 or Shooter's Choice grease, a non-MoS2 product.
There is another problem with using dry lubes in bearings, whether the lube be a TFCI, graphite or powdered PTFE. There is a certain clearance built into the bearings for the lubricant. When this space is not filled, bad things happen.
I lube my knives with a PTFE/oil (but wouldn't hesitate for a moment to use any good engine oil in a pinch), or PTFE/grease, as supplied by Chris Reeve.
For those of you concerned with the collection of dust and lint, either get higher quality clothing, or carry your knife in a nylon pouch. An added benefit of the latter is that you don't pick up scratches from other metallic objects in your pocket.
Hope this helps, Walt