All I did was add a few drops of Vallejo thinner and mixed it right in the airbrush cup.

I think I also added a drop of Ammo flow improver too. You usually can't go wrong with Vallejo seems to me, despite what others say. it just needs to be thinned ever so slightly.

DC-6 looks great with some paint on it, John (@johnb). I have used Vallejo Metals and like them. They say you can use them straight from the bottle, but I dilute mine with about 20% Vallejo Airbrush Thinner. Apply in thin layers until you get what you are looking for. They also seem to be fairly robust once they have dried. I don't use any flow improver, but it couldn't hurt. I haven't had problems with paint drying on the airbrush tip since I quit trying to use regular Vallejo paints in my airbrush. Tamiya and AK Real Colors are still my go-to paints, but I am getting more comfortable with Vallejo Model Air and Vallejo Metals. They seem to work well.

Good choices, Erik (@eb801). I use regular Vallejo for brush painting small things, but I could never get it to work reliably in my airbrush. Tamiya always works for me, and I am starting to like Vallejo ModelAir now that I have figured out the dilution. AK Real Colors are just like Tamiya paints, but they have a much larger range of colors. I have never used their Gen 3 paints in my airbrush because they seem to have the same qualities that make regular Vallejo hard to use. AK is a little harder to clean than Tamiya, but 90% alcohol does the trick. Lacquer thinner will also do the trick, but I try to avoid the hazards.

That is the secret I finally learned, John (@johnb). Supposedly ModelAir can be sprayed right from the bottle, which I tried initially. But the secret is they still need to be thinned some to spray well. All was well once I figured that out.

@airbum, thanks, Erik. Finally making some progress here.

The exhausts look really great, my friend @johnb, as does the extra white!

Nice updates to the engines. Looking forward to the next color!