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I am on board with Utopian...

I change tape when needed on the 1k, as soon as the shine is off the tape on the spine (I only use 3m 700)
I change tape when I move to the next stone normally a...

There is the answer besides what was already pointed out about changing the tape after either each grit or stage and of course after tape wear on the bevel set...

There has to be what is...