I have been using the Bostik Dri-Cote on many of my bits and cutters for the last six months.  It makes a significant difference in the speed and ease of drilling and cutting, especially when I am using large bits and cutters such as Forstner bits and raised panel router bits.  It also does not stain any of the woods I have used it on so far.  My only complaint is that there is much waste when I spray it on.  I often have to wipe off the drips.