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Weathering with Acrylic Paints

Image of PAT PETTETT.PAT PETTETT shows us how to dirty up a wagon....

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In this article, we will be taking an out of the box Bachmann tank wagon, and making it look like most wagons – uncared for and unloved. We only need a few things for this – a selection of paint brushes (including one that has seen better days if you have one), water, a selection of acrylic paints, and something to serve as a palette for mixing.

Weathering is not just dirt - there is more to it than that! Paint fades over time, especially for something that is exposed to the elements continually. Stickers and vinyls get scratched and chipped, so there is far more to think of than simply slapping dirty paint on things!

As we will be lightening the factory paint finish, the first thing we will need to do is match the factory finish. Lacking a direct match out of the pot some mixing is required – here is what we need:

Weathering 01.

Looking through the blues I have available, the best fit seems to be somewhere between Railmatch RM2207 Rail Blue, and Humbrol #14 French Blue. Mixing small amounts of the two together, we have our base colour:

Weathering 02.

As you mix you can test the colour match on an out of the way area, and in any case we are repainting the wagon so small variances are quite ok. Now we have our base colour we can start to drybrush the main body. But what is drybrushing? Almost as it sounds – we will be using a brush dipped in paint, and then wipe most of that paint off. We will also be using the brush in a particular way, to make the most of the raised detail whilst leaving the deeper recesses of the model untouched. This is quite rough on brushes, so don’t use your best for this – it tends to work better with old brushes. Dip the brush in the mixed paint, and using a piece of paper (preferably white so you can see the colour more clearly) wipe off most of the paint:

Weathering 03.

As you can see from the picture above, the first wipes of the brush take off a lot of paint – the strokes at the top show how much paint we need left on the brush. We need to draw the nearly dry brush quickly and lightly over the surface of the model (imagine dusting off an old model with a brush, you can work quite quickly). On the sides of the tank we work vertically, as this is the direction the dirt will slowly migrate in. At the ends and near complicated detail, we simply work at the most exposed areas. We can see the beginnings of the effect on the tank:

Weathering 04.

Notice that I have allowed the brush to pass over the branding on the side – this is intentional! As we matched the paint colours before starting, it gives a faded, patchy appearance, as if the paint underneath the logos is starting to show through.

Next we will add final highlights to the blue tank – to do this we need a lighter, flatter version of our blue. I start by adding some medium grey to flatten the blue:

Weathering 05.

We then add some white to lighten the paint up:

Weathering 06.

This is then drybrushed over the tank, more lightly than before as we don’t want too extreme a result:

Weathering 07.

Leave aside to dry for a while – we will now start on the underframe!

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The underframe. This is moulded in a black colour – it may once have been when the wagon was leaving the factory, but since then it would have been covered in brake dust and general grot – nobody gives wagons a bath...

Using a mid-brown colour, we water it down so it will not cover too thickly – there are markings present on the underframe and we still want to see them. Apply this "wash" liberally over the underframe, taking care that it reaches all the nooks and crannies. The details on the underframe can still be seen, and I have deliberately left the axle boxes clear:

Weathering 08.

The axle boxes will be covered in a darker but thinner wash once the first thin brown coat is dry – simply add some black to the paint mix, and thin it down with water – we are aiming for an inky consistency:

Weathering 09.

This is now liberally applied over the underframe to start with – all over including the axle boxes, the buffer-beams, and then we will add yet more water, before we run it into every sheltered area of the model – the paint will pool in recesses just like dirt does. You can even wipe the muck around with a finger if you want! If an area is covered too thickly for your liking, just add water to thin it down.

At the top of the tank, I’ve run the inky mix around the walkway and hatch:

Weathering 11.

The mix is also run around the bottom of the tank, and anywhere where dirt could accumulate, looking good so far:

Weathering 12.

We now move on to a few final details – whilst the ladder is painted blue, anywhere that sees reasonable foot traffic will have the paint worn off, so a touch of gunmetal paint is added to the rungs of the ladder. The shaft of the buffers also move frequently enough to prevent the build-up of dirt and rust, so we add some gunmetal there too:

Weathering 13.

And that’s it! In around half an hour, we’ve taken a bog standard Bachmann wagon and turned it into a well used but slightly uncared for example. It really is quick and easy to do this – you can spend as long as you want weathering if there is a specific level of gunge you are aiming for – most of all have fun experimenting and see what you can do!

Weathering 14.

Weathered example on the left, compared to one straight out of the box.

If you come into our shop Pat would be happy to show you his weathering skills, but he charges extra for facepainting....

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