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Finish on the 12k, and shave. Re-finish the same razor on the Welch and shave.

If worst, just re-finish on the 12k, again and you are good.

Using slurry is/can be difficult to learn and can...

So, if you are not getting a shaving edge from a Naniwa 12k, then something else is going on with your technique.

To trouble shoot your technique, eliminate all the variables or as many as you...

Try finishing on the 12k Naniwa, and leave the Welsh Slate out of the progression. You are probably going backwards in grit with it.

A properly stropped 12k Naniwa edge is a fine shaving edge, if...