SuppressionFire:
Apply the tape to a sheet of clean glass, use a new #11 hobby blade & a metal ruler to cut many strips. Choose just the ones that turn out perfect. The glass will remove a bit of the adhesives 'tack'
And if you don't want to lose any of the tape's adhesion, cut a strip of tape and apply to a piece of silicon baking paper before using the aforementioned #11 blade and metal straight-edge to cut your narrow strips.
Alternatively, one can buy rolls of micro-masking tape down to a width of 0.5mm.