For more information on Sharpening Stones, see our beginner site Common Woodworking.
I had a question on sharping for you. I want to buy diamond stones and know you recommend them over Japanese water stones but which ones do I buy? There are several out there to choose from, DMT, EZE Lap? And what about grits too?
Firstly, I find little if any difference between EZE Lap and DMT in terms of abrasive quality. Both cut steel fast and both are good quality products I can recommend any day. They are both dead flat and I have used both for extended periods. EZE Lap seem less expensive and last well, as well as DMT. I do not have the ability to scientifically test either product so my testing is limited. That said, I think that a set of plates by either maker will last any individual woodworker for a lifetime.
One thing to remember is that even though they last, the surfaces do lose aggression through use. Therefore, I recommend EZE Lap Coarse plates because the diamond particulate is larger at 250. The other plates are the same as DMT. I have not noticed any difference in longevity, flatness or failure. The DMT Coarse plate seems too fine for restoration of damaged edges and first-level abrasion. After a few weeks of use they do change to a finer level, so you could be using something around 450-500 grit to try to achieve that fast result you want initially. Whereas, on the same basis for EZE Lap, that would translate to 350-400. As I said, this is not scientific testing at all and I can recommend both makers. I do like to restore my bevels effectively and so I think the coarser plate more valid.
DMT Extra Fine sharpening stones are 1200, Fine are 600 and Coarse 325 grit.
EZE Lap are Superfine 1200, Fine 600 and Coarse 250.