New guy question - masking curves

Tamiya's white vinyl tape is flexible and good for cutting in curves.  It comes in widths as narrow as 1/16 inch.   3M blue vinyl auto striping tape is also good.  I've found 1/8 and 1/4 inch widths at O'Reilly Auto store

Tamiya's yellow kabuki tape is a little tougher to bend into curves. 
Their narrowest is about 1/4 and doesn't bend easily into curves without a wrinkle.   With a sharp scalpel and straight edge it can be cut to narrower widths that will curve easier.   There are some millimeter & lesser wide kabuki tape brands available from the Japanese market. 

With either kabuki or vinyl tapes lay your line and burnish in well.  Overlap wider tape, leaving the edge exposed, to backfill the area to be masked.   I'll use blue painters tape here to save a bit of money on the whole thing

Airliner masking is hard, so take it a little at a time. A big challenge is what to do with the windows in the cabin. They usually get glued in before the halves of the fuselage get glued together, so they are there when the exterior livery goes on.

I paint the sides each over the primer with the window stripe color. Then I install the windows.

Glue the halves together, then mask the window/ window stripes.

Do all of the putty/ paint.

Great tips! Thanks!