Hi Mark,
I'll get a personal email headed your way soon, but I want to say that you're dead-on with your last post, I AM spraying the same material most of the time.  Once in a while I will use a two part clear, but I am usually using either nitro-cellulous stringed instrument lacquer or dope, and the properties are 99% the same, even as to the shrinkage rates.  (Comparing the nitro to non-shrink butyrate.) 
(The non-shrink is really a misnomer, of course, it should read something like "Not-nearly-as-much-shrinkage" or such. )
Mark, worry not at offending me, it's very hard to do, I just didn't want to have offended you for you obviously are a man of integrety and one who knows his profession very well.  I can see where you're coming from with the need to handle such a variety of materials.
Thanks for the kind words about my guitars, and you'll hear from me soon.
Blessings,
Will

That sounds like what we used to do in vacation bible school, you know, you would take a leaf and lay it on the paper, dip a tooth brush into the paint and flit it with your thumb to spray the paint on the paper,, I bet my mom still has some of those "paintings" I made then

Yeah Will you could, but then you would have to find one of those $300.00 military toothbrushes to get the quality!