Hi Jim, Yeagh im interested in this stuff alot too as you can see
For a chart of Viscosity for the guns I think your best bet would be to contact the manufacturer of the gun. I believe since the gun manfacturers are in the business of making guns then they also got to be in the business of knowing what the "Eflux" or viscosity of the liquid that a certain tip size or cap size can spray. They have to have this data otherwise what could they base a gun creation on.
I will do some hunting around on this a bit more to see if I can gather additional data.
Its kind of a inportant issue when you think about it. So the more we know
the more productive we can be right from the get go.