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Use a hoe and a wheelbarrow. Put the concrete mix in first. Make a hole in the mix, put water in the hole sparingly. You’ll need less than a gallon for an 80# bag so start with about 1/2 a gallon and add as needed. Work it back and forth until the water is mixed in.
Put the concrete in the floor and agitate it to push the stone down a little. Using a 2x4 long enough to span the hole, screed off the concrete to the correct elevation.
When the concrete has cured to the point that it can withstand some pressure from the flat of the trowel start smoothing it with the trowel, gradually increasing speed until you’ve got the desired finish.
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