Both of these weathering jobs have been done using washes of Tamiya acrylics.
The secret with this method is to start the wrong way round, and to do the grey first, then a wash of the faded colour, then pick out odd bits of the planks in the full colour - ie the bits of paint that have not 'flaked off'.
Using this method, you can also retriev odd bits of the original writing if you wish, so that some has 'flaked off' with the paint.
The bit thing that I didn't do on on the blue boxcar, because it started out black (but actually I should have done) was to line the joins between the planks with a wash of black, quickly wiping off the excess so that you get a good black shadw line in the grooves. I mastered this trick with the AMS wagon.
The last bit that I need to master, is the application of the colour onto the grey using a sponge so that the colour only touches the high spots, and the grey remains in the 'grain' of the plastic wood. This wouldn't have worked on the boxcar as there is only raised grain, not any indent.
For a complete, blow by blow account of weathering, ............................don't ask me, speak to Mel

