Compound, wheel, pad, substrate, and starting surface need to be selected together.
The supplied GUOWIN overview lists yellow, white, and black polishing compounds together with polishing and buffing wheels. These are system components rather than interchangeable standalone products.
A useful selection request describes the metal or other substrate, the starting abrasive marks, the available machine, the desired appearance, and the acceptable cycle. Wheel and pad choices should be reviewed alongside the compound.
Trials on the actual part remain the most reliable way to confirm appearance and process stability.