Jim Henley

All,
I have an elementry question, how do you know when you have the fabric filled with sufficiant Nitrate? I have two coats brushed on reduced with thinner 50 / 50, just like the instructions say to. I only have the fuselage and tail feathers doped out, I want to make sure I am getting the dope on correctly before tackling the wings. ( I will also want to check the incidence one last time in case I need to tweak things before covering them in dope.
Thanks!