Grandt Line website, I really didn't like the yellow finish they show on the model. I know these things live in mines, but I associate yellow painted tubs with more modern metal versions. I thing dirty wood is the way to go.
My plan was to use the Lifecolor wood set, but when I tried the paint on the plastic, it didn't stick. Colour (should that be "color") pooled up as though I was painting on grease. I don't think it was mould release, just a shiny plastic and not very sticky paint.
The solution is of course, a spray of car primer. Grey seemed to be the best colour for worn wood and application went well, even though I didn't shake the can for 5 minutes, because I am a rebel.