If the model is already built, looks like you are looking to do something similar as in other kinds of modelling. In that case for precision and quality, try airbrushing with acrylic paints. Usually paper needs no primer base. You can also use rattle cans.
If the model is already built, and is already pre-coloured, airbrushing may be the best option for adding details.
If the kit is printed (but unbuilt) it may be more difficult. That's another matter.
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Rubén Andrés Martínez A.
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