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Atm, I'm using the SRD 0.5 micron diamond spray on felt sometimes followed by jewellers rouge on felt. My preference is for a paddle & yes you need separate medium to avoid cross contamination.

Hey Aaron. You won't need a 12 & a 16k for a progression. They are pretty much interchangeable. Just pick one & follow with pastes of choice. Correctly used the diamond sprays will improve most...