Repairing or replacing stamped concrete
A stamped look can't be added to concrete that's already hard, because the pattern has to be pressed in while it's soft, so a new stamped surface means a new pour. If an existing stamped slab has one bad section, a patch is possible, but matching the old color and pattern is tough and usually shows. When the slab is cracked across or sinking in spots, I'd rather replace the whole area so it reads as one piece.

