Right first time.
I'm making a set of foot square samples of concrete so @MrsRA can choose her favourite mix of glass and concrete, and then agonise over which colour she wants.
I have yet to polish one sample, let alone the half dozen I'll need before making a choice. I have a decent Bosch angle grinder.
My usual approach is to look at videos and I fancy this approach
But I'm not a fan of mixing sparks and water.
Advice, please!