Here are some shots after the first two color priming.
I will block sand the top white color off to reveal the gray undercoat and this should get rid of a lot of dips , scratches and pin holes.
When you first start to sand white dots ,lines and spots will appear. These are pinholes, sand scratches and depressions. The dark lines and spots that appear are high spots and ridges. If you continue to sand just until the white primer goes away you should have a pretty smooth body ready for the final primer coat. I have to decide if the final color looks better over white primer or dark gray. I sprayed two small pieces of styrene with each primer and will paint them with the blue and compare them to actual pictures of the real car to see which is closer.