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My granite floor appears to be developing cracks beneath its surface. These cracks do not go all the way through the tile, but can be seen only in a bright light and only at certain angles. It almost looks as if they’re cracking from the bottom

The condition you are describing is called compression cracking. It is caused by movement of the substrate to which the granite is attached. If the granite tile is set over a plywood floor supported by joists, movement in the floor may be responsible... Read More

Can I use an oscillating sander to hone a marble table top?

Of course you can use an oscillating sander but an oscillating sander tends to leave a stray scratch pattern that can be difficult to remove. I have found the best method is to use a rotary polisher for best results. TIP If the top is large enough... Read More