Don,Very interesting Jason. Probably the best way to initially make a paint more translucent would be to add Behr Faux Glaze to it.
What do you think about using Valspar Clear Protector in a flat sheen?
I was also thinking that I could incorporate some very transparent pigments to make a very translucent neutral gray that would still get down to the vertical grooves still get some selective dispersion of the light. I'm not too familiar with the Behr Faux Glaze so just wondering if that would allow mixing in of other acrylic based pigments. Also concerned about the sheen for Behr Faux Glaze.