After many requests,I have finally got my lazy butt into gear and put together a basic vehicle weathering how-to. The main technique you need to master for this is dry brushing. For anyone who doesn’t know what dry-brushing is, I’ll explain.
Once you have dipped your brush in the paint, you need to use a rag to remove as much of the paint as possible, so that the brush is almost dry – hence the name. Then you simply flick the brush back and forth over the part you want to weather. The more times you flick the brush across an area, the more weathered it will look. Check out this Alley Viper shield as an example (weathering isn’t just for vehicles);

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"The future's uncertain and the end is always near." - The Doors "Roadhouse Blues".