In much the same way as D3721 was started, the loco is upside down in a foam cradle and has been airbrushed with Railmatch Sleeper Grime, the enamel version. The wheels were rotated 1/4 turn after each light spray so that there were no shadow areas behind wheels or motion. This process also helps the pickup wipers to clear the wet paint from the rear of the wheels if any strays that far.
The airbrush in use this time is an Iwata HP-SB Plus, one of my two favourites, which allows me to be quite accurate with the small quantities I'll be wanting to apply to this small loco. You can just see (I hope) that the paint has reached the chassis area but not strayed into the bodyside panels.
I haven't knocked anything off yet!