Short session

Put a third and final layer of white primer on the inside of the Puma. No issues with the white paint again.

Cut off all the blades of the plastic propellor, since the photo-etch propellor installed nicely. Since I had to load black primer in the airbrush to paint it anyway, I lightly sanded the nose of the submarine (where dust had gotten on the model while painting) and touched up the entire nose. It looks a lot better now.
Needle-tip went dry again, but at least we're having results. Practice, practice, practice.

Next time, I'll be experimenting with clear varnish (gloss or matt, yet to be decided) for the Puma as well as the submarine.