Do I sand the top or use another piece of wood to flatten the top?

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I am about to start on making a cable reel into an outdoor table. I am going to do a mosaic tile design on the top. My question is, the reel has been outdoors and the top is a little warped. Should I sand it back, it would take a lot of sanding , or should I put a price of timber on top and then tile it?which is best?

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