I bought a beautiful solid walnut dining table last week from Room and Board. I've never had solid wood furniture before, just particleboard-veneer IKEA stuff, so I nearly had a heart attack when I encountered my first water ring after leaving a glass of cold beer on the surface without a coaster.

I managed to remove it after trying a bunch of different things recommended online.

I'm wondering if there's something I can do to seal the surface, and prevent this in the future or am I stuck with this delicate piece?