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I used to work for Increte.
The Concrete started to set up before they stamped it, there is a Delay product they could have used. Did they use colored concrete or a color hardener?
The powder that was on top that didn't allow you to see the stamping was the Release material - this doesn't allow the Stamp to stick to the concrete & gives the final look a depth as some of that Release is pressed in. The release gets washed off before Sealing.
The final product gets sealed, a lot of time by a Zyline based sealer - nothing will stick to it. So they cannot come back and pour 3 inches on top of the other slab.
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