That was fun. The aim, as I’m sure I’ve mentioned before, was a loco that looks clean and fairly tidy at first glance, but really shows the dirt close to.
I'm not sure anything really shows in this light. Anyway, I made up a mucky brownish-black, thinned it a lot, and sprayed at low pressure and small needle size on the sides. I started at the skirt and applied a general light coat to represent road dirt and grime. I then worked around all the grilles and openings, wiping off the paint with a thinners-dampened cotton bud, always wiping downwards in the direction rainwater flows, followed by a quick wipe downwards with a clean bit of paper kitchen towel. The idea was to leave grime around the bits that stuck out from the body sides, but also to leave a very light dusting over the sides. Easier to do than say.
The roof I wanted the classic mucky strip down the centre where the carriage washing plant never quite cleans properly. I ended up wiping a fair amount off. This serendipitously left grot in all the nooks and crannies and looked quite pleasing to my eye. I followed up with a gentle blow over of matt black, with plenty of clag round the exhausts.
It's knowing when to stop. I’ve stopped. I’ll leave it alone and review things later. Muckying the nose ends is a bit more of a chore, but I’ll get there. As for the chassis, I’m going to let it stand until tomorrow, then see how I feel about it.
So, a fairly pleasing day's work.