Lapping Fluid for Diamond AbrasivesPopular Woodworking is proud to partner with Titman Edge to bring the original James Barry sharpening stones to the US market. This petroleum based sharpening fluid is for use with the Titman Edge diamond stones, credit card stones, and tapered files. Using the fluid, not water, prevents your stones from rusting, and carries away the swarth, or metal residue, produced when sharpening. The Titman Edge stones are backed by a 5 year warranty when used