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All of the builders & construction people here call these counters 'cultured marble'. I don't really what it is made out of. One of the builders here told me that they are made out of particles, powder, resin, pigments, etc into a solid product. So it's not like a natural marble rock. Even with all of that said, I think it would be a good idea to seal it after to prevent future staining, but I don't know what product to use to do that.
I'm really not sure. It works if the countertop is made of the same material all the way through. Many cultured marble & acrylic counters are solid with the same material all the way through. You might want to try sanding a spot underneath, out of sight, to make sure first. Good luck!
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