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I don’t have a video on that specifically. I would just use sandpaper, but to get the shine back you’ll have to top coat. That will be challenging with a ball. Maybe spray it with a glossy lacquer?
I just bought one, waiting for it arrive. While looking on Amz, I was trying to figure out if it was electric and rotated. Does seem like it would work easier if that blade was stationary.
I’ve tried it with a stationary blade and it’s harder to use on curved or jagged edges (like a geode mold). The swivel helps it follow all the curves and edges more closely.
You can use it for sharp edges on any resin item. It is harder to control on things like a round coaster (easier on straight or concave edges, harder on convex edges), so it will take some practice.