RE: Lozenge
For my time and effort the most trouble free way I found to do a lozenge scheme was to make stencils out of a very thin type of clear mylar found in a good art supply store. I did a 1/4 scale Fokker D-VII for my first attempt ( 5 color). Each stencil was for a different color, and they were all keyed together so you could keep the next lozenge lined up in its proper place to paint it thus assuring proper overlap. Since this was a gas model, I used latex house paint sprayed with an airbrush. The paint dried quickly, and I even sped things up with a hair dryer. Very satisfactory results.