Concrete Counter Sanding and Parging Tools, Tips and Techniques Discuss Concrete Counter Sanding and Parging in the Pizza Oven Design and Installation forums; "If you want to use power tools on it, you should let it cure for at least a week, possibly ...

[Neil2]

"If you want to use power tools on it, you should let it cure for at least a week, possibly more depending on the conditions, or you'll just knock/tear the aggregate out of the matrix and end up with holes and deep scratches."

Splatgirl is right. I have done a few counter tops of polished concrete. I generally let it sit for 3 days and do the initial surface cut to expose the stone and do any shaping required. I then let it cure for at least 21 days (well wetted) before starting the polishing.