Hello,
I have an old 1947 concrete laundry sink from the house we are rebuilding that I saved and am refinishing.  We plan to install it in our new mud room.  I have given it a thorough cleaning with bleach and simple green, then wet polished it with diamond pads: 60, 200, 400 grit.  I painted the cast iron drain assembly with a rust encapsulation primer/paint (Eastwood brand).  Now the last step, recommended by our plumber, was a concrete sealer.  I’m looking for a product recommendation.  I’d like something that I can apply once and forget about, and that doesn’t change the appearance of the raw concrete too drastically.  We like the natural look of this old sink.

We have considered some sealer advertised for concrete countertops.  

Let me know what brand / product you’ve used and been happy with!

Cheers,
Evan