You can pre-shade a model before base coat.
For example, prime white, wash with Nuln oil. Using *thin* paint, apply the base coat. The darkness from the wash creates a very natural darkening that shows through the first one or two passes of a thin base coat.
Where the wash has run off, like raised details, the lighter primer will show through as a highlight.
I like bright models, as they “pop” better. This process wouldn’t work with black primer or a dark grey, but can be used with lighter coloured primers.
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