Bellstone/Yanzhistone polishing stone is made of high-purity alumina abrasive material WA and processed by the VITRIFIED method. It is strong binding force, impact resistance and not easy to break.they are specifically engineered for polishing/finishing various metal surfaces such as regular tool steel, stainless steel, hardened tool steel, aluminum, brass, castings and other metallic materials.
Before you start: It is our opinion that a lubricant should be used with every stone type for faster material removal and better surface finishes. Bellstone VH type stones also require a lubricant to prevent the stones from "loading up" and to promote rapid stock removal and a smoother, superior surface finishes. Lubricants are generally made of a "kerosene" based substance (i.e. odorless mineral spirit).
How to accomplish a fine finish: Lets assume, based on the surface finish you have on hand, that you wish to start with a 220 grit stone, you proceed by applying some lubricant on the surface area to be polished (and/or dip the stone frequently in a jar of lubricating fluid). Now move the stone in a reciprocating motion forward & back (about 3/4 inch or less depending on available space to move around) over the entire surface area to be polished. Upon finishing this first step and having completely removed all pits, deep scratches, waves, etc., you can now proceed to step two, the next finer grit stone. Before going on to a finer grit stone however (for a finer finish) make sure to clean the surface thoroughly from all debris left by the previous stoning process.
NOTE: It is always better to start your finishing process with a stone that has a finer grit size. Meaning, if the surface looks to you that you should start with a 120 grit stone, try the next finer grit like the 220 grit stone first. Doing so, you may find that the 220 grit stone will do the job as well and thus, you saved you an extra step in the entire finishing process!
When moving onto the next step, a finer grit stones, use the same reciprocation motion, but change the direction previously used by 30 to 45 degrees. Doing so, will allow you to remove the previous finish (all lines gong in the previous directions) and you will be able to clearly see when each step is completed and is ready for the next finer grit. perhaps a 320 or even 400 grit?
NOTE: As you move on to the next finer grit stone, make sure the surface is always cleaned before going on to the next step until you have accomplished the desired final "stoned" finish.
Upon reaching a 600 or even a 900 "stoned finish" you may continue by applying diamond compound (or other quality buffing material) and use felt bobs, felt sheets or polishing brushes to obtain the final, highly polished mirror finish.
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