Some very nice dry transfer stencils are being made for a wide variety of aircraft models, and some markings are two- or even three-colored, and the sheets are indeed multi colored from end to end. These are in every scale up to 1/24. I'm currently using them on a trial basis, and I can't believe how nice it is to have your stencils disappear down into the paint rather than ride on top like a rash on your model. They are, indeed, fragile and time consuming, but a/c modelers are better off than they were, when these marking were only the domain of armor guys.
Q, I was not even aware that Letraset was in the model markings business. I know them from my journalism school days, when we all dreaded having to take that boring old typography class. But with the advent of computer graphics and print production, I assume the makers of press type will have to branch out in order to survive.
Tom