[Fireskull]

After it dries, you can put the nail polish finish over it. You must be very careful to apply only one brush stroke over each area or you risk "smudging" the paint under it.

You best test it, for example, on a scrap piece of plastic in the model kit or even use the interior of the fuselage as a test bed. Nobody will see the paint and nail polish finish if it eventually goes inside the aircraft for a test. After some tests and practice, then you are ready to do the same thing on the exterior.