Unless you want legitimate brushed on pinstripe I think as mentioned earlier vinyl is the way to go. If was going to try this I might use automotive pinstripe and some contrasting threads tape to the frame as a guide.
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“One morning you wake up, the girl is gone, the bikes are gone, all that's left behind is a pair of old tires and a tube of tubular glue, all squeezed out"
Sugar "Kane" Kowalczyk