I made some homemade Yorkshire grit from beeswax, mineral oil and diatomaceous earth. I have more materials than I’ll need for the rest of my life. So I put a bunch in the bottom drawer. Feel free to use it if you need it
I usually sand up to 600 grit then I finish with the polishing compound at 400 rpm. It will bring out defects/tool marks and if you sand after the compound it will eat your sand paper but it gets a really nice polish on finished projects