I am part way through weathering some of my own tank wagons - an Airfix Class B and a Mainline 14t Class B

Here they are together before weathering:

unlike Mike Delamar I haven't changed the walkways or ladders on the Airfix kit and I forgot to paint over the restraining bars on the Mainline vehicle - I will come back to that in a later blog.

So a general wash of ink and water followed by powder - then running wet ink down from the filler and adding dry powder to this results in:

Class B Tank ( note how the old AIrfix decals show up on the side of the tank)

and

- notice the shiny metalwork - will go back now and sort that out...

enjoy