Bill,
I would agree with this. Most of a front row finish is in the prep of the airframe. I have one method (generally) of building up to color coats if I'm building a plane without open bays. Another for planes, like this last one, that is mostly open bays. More air than wood exposed in that one. But however you do it, once you get up to primer/fillercoat, you have choices to make. I doubt I'll use urethane color coats again. I might, but probably not. I'll stick with lacquer and perhaps use 2 part urethane topcoat, whatever I use to build up the surface.