The noce weather allowed to prime all the skins' interior. After having some difficulties: some droplets due to the paint reservoir not being completely closed all went quite rapidly. The longest part being the cleaning process.
As I had some leftover paint, I decided to try the aerograph bought on Ebay. It works nicely for small touch-ups as there is no paint mist and the thickness of the paint layer is very thin. I did all the main spar countersinks.