After it all going a bit wrong with the etch primer, I decided to sand out the runs and have a go of the high build primer I’d bought. It’s a lot thicker, as you would expect, and I set the gun and gave it a go on the rear quarter. Straight away I had a much better finish, so I carried on and covered part of the roof. The roof came out a lot smoother than the quarter, which was a little rough when it dried. I went and got some measuring cups from the local Asda, and mixed some more paint with a bit more science. This went on much better, and I did the pillars and sill. All looks good to me.