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An airbrush sprays almost "dry" paint.
The paint is atomized as it leaves the airbrush and is virtually dry when it reaches the
surface...although you can build up enough paint to create a wet puddling effect.
So I would use an airbrush sparingly on a paper model.
You wil probably be using waterbased paints, which is acceptable, but you could easily
overload an area with paint and create a weakened state that could result in stretching,
tearing or deformation (wrinkling).
If you "paper" is already covered with putty and/or primer this would hardly be a concern.
I could see using the airbrush to add shading, weathering and textural detail in much the same way airbrushes are used in other scale model work.
In that case, spray airbrush watercolours and paints, with minimal reduction (less thinning) and build up layers slowly to avoid "wet" painting.
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