Hi Allan,
Personally, now I like painting wet into wet but when I was a student I preferred to let the first layer dry overnight and start the next day with fresh paint on top of the block in. The advantage of working wet is that you can manipulate the edges better. Now I use this monochrome method only for fairly low colored work and most of the darks are left alone. This means that I have to integrate the edges of the first layer darks with the over layer of opaque paint.
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