Using the Eraser tool, set to use 0% pressure, can be used to dry areas of wet Watercolor paint. In my attached example image (at the bottom of this post), the large blue area of paint was done using the default watercolor tool settings. I then used the Eraser tool to dry the right hand side of the paint. Using the Default watercolor tool settings, I went over the blue paint with yellow. As you can see, the yellow paint being dragged over the dry side, picks up the blue paint, making green, but retains a dry edge, like it would in real watercolors. On the left side, where the blue paint is still wet, the yellow paint bleeds out at the edges.
Originally Posted by Steve B
You could create a new layer, give it the Multiply Blend and texture you want, and then use it as a template. Just give it a name, so that you don't actually use it, then use the Duplicate Layer option, rather then Add New Layer, to make a new layer with those traits. You can create a shortcut for the Duplicate Layer feature, so then it'd just be a matter of selecting the blank layer, and hitting the shortcut key (and maybe moving the layer to certain area of the stack).
Nothing is easy to the unwilling.