Yes you need to have your marble sealed with a good quality penetrating sealer as it is a soft, porous stone. Unsealed marble will absorb liquids, which will lead to staining. Although sealing your stone with a penetrating sealer will not protect it from etching it will protect it from staining and it will help preserve the look of your marble for longer. A penetrating sealer is recommended instead of a surface sealer as a waxy surface sealer will sit on top of the stone and eventually become scratched and dull.
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