Yes, this is the one I saw and I was blown away
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Yeah I love it here. I'm station on white beach in Okinawa. I used to ride here and it was incredible but I wrecked and fractured my spine. So I decided I needed a new hobby so I didn't go bonkers. I leave in 6 months to go to California but my three years here has been amazing. And thanks for the tip, I actually noticed how good the sandpaper was right off the bat. My dad's a handyman and I kinda got forced into it at 8 years old haha.
Find some one that restores old Japanese swords. Those guys put the shine on things that is AMAZING and they use stones for most of it.
Other than that? Silicon carbide wet/dry "sand" paper works great.