Nothing was mentioned about painting the neck. The OP wants an unfinished fingerboard edge, which is what I prefer on the guitars I build with an unbound ebony fingerboard.
Mask with thin plastic tape, not regular masking tape. That minimizes the ridge that is left. Place the mask just above the joint so that ~1/32" of the fingerboard is showing. After the finish has cured, taper the finish with fine sandpaper and a small rubber block.
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