Buying guide
Choose rock tumbling grit by stage
Compare what the stage contains
A coarse-to-polish rotary assortment may include a coarse silicon carbide grade, a medium grade, a fine pre-polish and a separate final compound. Match the actual grade and compound to the steps you need rather than using the packet number on its own.
Check the vibratory sequence
The manufacturer or supplier may provide a different sequence for vibration. Use the grades that are approved for your machine and the state of your stones. Compare the included quantities and the instructions in the selected pack.
Keep the polishing stage separate
Follow the manual's cleaning and bowl recommendations between stages. For the documented Raytech models, the instructions advise keeping one bowl specifically for polishing to avoid carrying cutting grit into the finish.