I took some classes in that stuff. They're cheap to make, and easy to make ugly, also easy to make beautiful with a little understanding of the different techniques. If I was going to cast it then install it I'd use lots of plastic reinforcing mesh so it doesn't break (concrete will crack no matter what) and I'd cast it upside down then flip it. You can incorporate some cool stuff casting upside down (shells, rocks, etc.) and it's easy to vibrate it and eliminate air pockets, then polish it and seal it well.
I'd also include a shout out for hard rock developments in Calgary, they have all the stuff you need and rent grinders and polishers. If I went there I might be tempted to really consider their epoxy countertops. No cement involved, much lighter, and easy on the china wear which concrete sure isn't.
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