Again, late to the party...............
I am th e*Blind Hog*, so I get jabbed a lot for what I do by Randy and Mark....
I use Nitrate for everything until after I apply the covering. The covering gets 2-3 coats of Sig Supercoat Clear (it shrinks!!!!!), then Sig Litecoat Clear until primer.
Billy Werwage use to use Aerogloss clear, exclusively, for base coats and covering. But, that stuff changed and he changed. I started using the Nitrate method from advice given me by Bob Hunt. I use Randolph's tinted, non-tautening nitrate as much as possible, but Sig Nitrate if I have to.
The colors have been all over the place....... automotive acrylic lacquer before it was banned around here, Sig colors, basecoat colors, Randolph's, Duplicolor (both spray cans and Paint Shop quarts), but always a *lacquer based* paint (except the base coat). Final clear is now either Butyrate clear or Automotive two part Urethane.
Thinner is ALWAYS 3608S Dupont. PPG flex additive in the finish coats (everything after the shrink clear of the covering).
I made the mistake of adding a bunch (too much!!!!!!) of Sig Retarder to some red on my Vulcan. It caused the 1/8th blue vinyl tape to pull some paint when I was trimming the plane. One other time (in a rush, was out of 3608S) I substituted some hot thinner from PPG and it faded the metallic blue on the fuselage bottom of a plane.
What I do does work, it is proven, but I have been doing it for years, so your mileage may vary.
Mongo