Bike frames are fairly hard to stripe as you've got a curved edge, but not impossible. You'll always have that 'by hand' element but this is actually quite nice. I reccomend a pin-striping brush as you can get a lot more paint into the brush. It will also soak up an unsteady hand (well, makes sense in my mind anyway)
At first it will be much harder than whatever you're currently doing, but after a hour or so you'll be able to do it much better than what's already been done.
What brush were you using for the lug-lining?
Bike frames are fairly hard to stripe as you've got a curved edge, but not impossible. You'll always have that 'by hand' element but this is actually quite nice. I reccomend a pin-striping brush as you can get a lot more paint into the brush. It will also soak up an unsteady hand (well, makes sense in my mind anyway)
At first it will be much harder than whatever you're currently doing, but after a hour or so you'll be able to do it much better than what's already been done.