Flaking Paint
There is nothing like having that lovely old bit of stock on your layout, and weathering is one the most important things on the modelling agenda.
Starting off with a dark blue, once dried fully and I hasten to add FULLY ! then you can add a layer or preferably two heavy coats of cheap hairspray, allow to dry then apply a lighter colour ... I chose sky blue, again allow to dry but not fully just to the touch so its soft.
Now the trick is to use very sparingly a light coat of Nitromors, as soon as it begins to bubble and flake wash it off in warm soapy water GENTLY !!, allow to dry overnight, then repeat the process until you are happy leaving the already affected areas intact.
I finished off with a light coat of grey as was used on these old Toads, white paint and lettering was then applied, then to finish off weathered lightly all over the brake van with an airbrush.