This has probably been discussed before, but I haven't found it yet.
Mark seems to mix all of his color croups at once in the beginning of the painting process. Then he draws from the mixed color groups as his palette while painting. The long open time of the Geneva paints or use of the SDM makes this approach possible.
Has anyone tried mixing only one or two color groups at a time, then painted only those areas of the painting that contain those colors? What would be the advantages and/or disadvantages of an approach like this?
I've been trying other approaches that requires mixing-as-you-go but they don't seem to work well for me. I think my personality is more suited to Marks more methodical workflow, so I intend to come back to it. I'm examining the possible variations now.