Quote Originally Posted by kevint View Post
I think they do get smoother, My 400 is way more aggressive than my old 120.

I think the diamonds cleave, not only leave. So after so much use they are not as sharp nor as large.

This is the main reason I don't like diamond plates for sharpening. When using 1000 5k 8k, I want to know that it will be the same today and tomorrow
Quote Originally Posted by RayG View Post
Have you tried looking at the surfaces of the plates under the microscope, Sham? It might be useful to see if the two look similar, and also if there is a big difference between the center or the 1200 and the lesser used parts of the plate like the corners.
Ray i haven't check them under them microscope but i have used 1200 so much i know it doesn't act same as early . now a lot slower and i have checked the bevel it gives now almost same as 8000 dmt.