Using a Digital Watercolor brush, I'll lay down a layer of a dark color. Then, I'll select a lighter color and work back into it to highlight it. Works great, and as long as I have the file up and running there are no problems.
The issue comes when I close the file and re-open it later. I can no longer lighten the existing digital watercolor layer with a lighter color, I can only darken it. Basically, it seems that once the file is saved, the digital watercolor layer is permanently dried.
Does anyone know how to get an existing digital watercolor layer to function like a fresh layer?