How to polish mackerel stone by hand is as follows:

1, polishing polishing mackerel stone before you need to clean up the aging part of the chewing surface. In addition, the aging part of the mackerel stone situation of the fishy odor is heavy, cleaned up and polished can reduce the fishy odor in the polishing process.

2, glue solid protection work

Preventing the process of grinding process cracking and collapse ballast process, applicable to the sanding machine or carving machine grinding, mainly for preventing the grinding process occurs popping ballast.

3, repair rough grinding

Select sandpaper as a grinding tool, with 180 mesh-400 mesh sandpaper, the mackerel stone surface impurities, cracks remove clean, and will be mackerel stone shape sanding, sanding process should pay attention to friction heat problem, friction overheat may make the mackerel stone produces a new fine cracks.

4, fine grinding

The rough grinding of mackerel stone for fine grinding, coarse 180-400 grit sandpaper will form scratches on the surface of mackerel stone, so only rough grinding of mackerel stone can not be directly polished. What you need to pay attention to here is the control of water and humidity when sanding. The basic technique is that as the sandpaper is used more and more fine, the amount of water dipping should be gradually reduced, to 5000 mesh and above can be dry grinding.

5, fine polishing

Fine polishing of mackerel stone will present a jelly-like texture, pink color, smooth as emerald.