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Question:

How do I know if I need to seal the marble on my bathroom vanity?

I recently purchased an expensive bathroom vanity with a marble top. I was told the marble was sealed and I didnt have to do anything to it. But now when water splashes on it and I wipe it it leaves a dark spot that goes away after about an hour or so. The weird thing is the marks do go away but they dont go away fully when I wipe them.

Answer:

Contact your local building center and ask them, they will guide you in the right direction.
When many types of natural stone are wetted, they darken and that sounds like what you are seeing. When it dries out it lightens again. I would seal the surface with a solvent based penetrating sealer sold at home centers for this purpose. It should slow or stop the wetting and darkening and reduce probability of staining.
This Site Might Help You. RE: How do I know if I need to seal the marble on my bathroom vanity? I recently purchased an expensive bathroom vanity with a marble top. I was told the marble was sealed and I didnt have to do anything to it. But now when water splashes on it and I wipe it it leaves a dark spot that goes away after about an hour or so. The weird thing is the marks do go away...
they offer a variety of granite cleaning products and sealant products. They have Stone Spray N Seal ($39 for a quart) and Marbamist Stone Counter Cleaner ($25 per gallon). They also offer Stoneglide wipes, which are becoming more popular as a cleaning alternative. Like a damp paper towel, you grab one and wipe down your counters, without spraying, without mess. Cost is $14 for 50 sheets, which could last you almost 2 months at 1 per day. So plan on sealing your granite or marble counters every year, and plan on cleaning them with special marble and granite cleaning products. Avoid 409 and other generic cleaning products - choose granite and marble designed cleaners. With a little effort, you will keep your counters free of dirt, germs, and scratches for many years.

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