I have the white base coat shot on the wings, stabs and rudder. On the areas that will be solid white and yellow I shoot to get full coverage. On areas that will receive red and blue may be a bit thin, but will have full coverage when they are shot.
At his stage, this is pretty much your last chance to fix any flaws. The old adage about painting is, "if you want to find your imperfections. just shoot a coat of base color". It's amazing how many hours you can spend going over every inch of the surface and think you have all the little blemishes fixed, until you shoot on a base coat. because the surface is so uniform, imperfections are magnified. A little microscopic dent now looks like a moon crater. I had a few little small dents in one wing that I never saw, but jumped out after the white base was shot. The other area I tend to get imperfections is on the edge caps of the ailerons and stabs.
This step takes just a few minutes to fill them with glazing putty and wet sand back. Trust me it makes a massive difference in your final finish, so don't skip it. After I sand back the putty, I just re-shoot those spots with white. That's another thing I love about HOK paint is the ability to repair spots on the fly. I just fog in a few coats over the putty and you can never see any edge buildup on the repair.