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I would recommend that you use the 4K after the sandpaper. The 4K will smooth out the sandpaper's scratch pattern. If you are using a sandpaper grit that is sufficient to set a bevel, then I would...

Any question that begins "is it normal to..." is really hard to answer. In this instance, it depends on...

the particular razor, specifically the type of steel and the grind
the state of the...