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I have an old 42" diameter round marble table top which I would like to restore. It is very dull and has deep scratches. On some of the edges, tiny chunks have come off.

I would like to know if this is something I can do myself with a drill and a flat backing plate for circular sanding?

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Deep scratches and broken edges are a bad sign. If you want to learn about stone polishing, this would be a good learner project. Don't expect to be able to craft a Michelangelo. A matte finish would be reasonable, and expect to leave the deeper scratches in place.

Matte marble finish should be polished out to 1500 grit. Gloss finish out to 3000 and buffed

These diamond pads are meant to be used wet and no higher than 4000 RPM. Buffers are the usual motor, but there are a few angle grinders that are variable speed and slow enough (Metabo and Makita). enter image description here

A velcro back is handy to changing the pads.

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