Weathering with acrylic paint

Here are the steps I used to paint and weather some metal die cast machines for the roundhouse.

The machines are made of 'white metal' - some kind of alloy that is shiny silver in color.

First I painted them green and let that paint dry.

Then I diluted some black paint with water and covered them with this 'wash'

The machinery is now positioned inside my two roundhouses, and can be see here.