I took some time and finished it.
The video I posted said you could use 50 grit diamond pads. (all the other grit pads worked great)
These ware out way to fast. I went to home depot and bought 4” double row diamond cup wheel t6his work so much better to expose the aggregate. This did the job in a 1/10 the time it worked so well.
The reviews said that it worked on big countertop top and he loved it, he was so right.