Out of the box this locomotive has a rather shiny smokebox, much more so than I would have expected. Before going any further I decided to apply a layer of Testor's Dullcote to that area so that pigments could be applied at a later date and that I could be sure that they would stick.
Dullcote dries very quickly into a usable state. These photographs were taken only two minutes apart.
My masking wasn't very good, so the Dullcote has landed on part of the leading wheels. I'll need to load up the airbrush to cover that small patch with another layer of Sleeper Grime. This was a good example of the change in appearance a layer of varnish will make to a carefully planned and coloured area of rolling stock, whether it has been done with paint or pigment.