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The only time the pencil comes off prematurely is when there are parts of the stone that are close to being flat and the built up slurry takes it off. This does take a bit though, the slurry doesn't...

I do the grid with a pencil. The lines don't need to be square since they're just a reference for where the stone is contacting the sand paper.

The slurry may remove pencil on areas where you're...