Here's a quick graphic to give you an idea of what Tom is talking about and then a few pics of an early P-51 and my latest Zero.

P51 taped, primed and then a few of how it looks after paint and weathering.

On the tail of the Zero you can see a combination of the chart tape and layered painter's tape to give me both the fillet panel around to forward root of the vert.stab and panel lines on the rest of the stab.

On the wing there is a bunch of HVAC foil tape which is great for doing access panels, hatches, inspection covers, etc. Entire A/C gets a silver base coat so when the weathering is done and color is lightly sanded away, edges chipped etc it really makes things "pop"...especially the foil tape accents since it really is real aluminum showing through.