Originally Posted by
atercz
Hello,
Naniwa Flattening Stone (NFS) is very usefull for quick and rough flattening of large slates (and soft stones). Diamond plates are too small for stones bigger than 300mm and sand paper is slow. But you have to use finer sand paper after NFS. It's leave coarse surface of stone.
Diamond plates are faster than NFS. I think for Naniwa SS it is not bad choice, but Atoma 400 is better. Soak NFS before use it. Better is half submerged in water during flattening of another stone. NFS is very hard and wear out slowly if you will use soft stones (Chosera is hard stone).
I think Atoma 1200 is to expensive and less usefull. For stones finer than 6k use another 6k stone for improve smoothness of stone surface. It's possible to use syntetic nagura. But naguras are small. So result may be little uneven stone. I use King 6k (185 x 62 x 19 mm) often.