The color development has been toned up to hide the base color even better and create a stronger top coating.
In the case of brush painting, thin the paint in a 1:1 ratio. For airbrushing, you may want to use as low as a 1:3 paint/thinner ratio.
Used with permission, copyright 2021 Gunze Sangyo. Copyright 2021 Brey Corp. t/a Hobby Works.