A 2K polyurethane paint is used for the second coat.
With the aid of measure spoons (borrowed from my wife) it is mixed in 3:1
I tried to spray with the Badger airbrush and although this worked for the small corners, it was to small for the bigger parts. The book "How (not) to paint a locomotive" by Christopher Vine gave the answer and I started using a normal spray gun.
I bought an 0.8 nozzle for my AirGunsa AZ5 and the paint thinned a bit more than 10% (almost 25%), it went a lot better.
Before painting the steam cylinders, the were assembled and fitted with sealant (Loctite 5926, is an automotive sealant which I used before with success for my 5" 14xx class loco)
Make sure you clean very well afterwards with cleaning paper you throw away directly afterwards. Otherwise silicone contamination could occur and this does not mix with the paint job.
The smokebox in the final primer coat. Before applying this coat, all the in between spaces were sealed first with Loctite 542 Hydraulic sealant, before assembly. This is a quick and effective way to prevent rust developing between the contact surfaces.
A cake decorating turntable was used to revolve the parts during the spraying.
The first assembly steps.
Small parts drying above the gas heating.
Coupling and connecting rods make a nice contrast with the red frame and wheels
The valve gear assembly.