For anyone that wants to know......I used blue masking tape to create the lines. The sharpness of the line has everything to do with application technique.
I used a cloth to stain the wood. After soaking the cloth in the stain, I started in the middle, away from the tape line. Once majority of the stain was used from the cloth, I would lightly blot in the tape line. That way it's easy to control, and you don't get any drops or bleeding. Almost looks like a glued binding. Getting clearcoat from here.
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