Hi Centurian.
I have been using gaouche for years, mainly for uniforms (base colours), and chips and scratches (then using oils to simulate weathering)
I have a heap of colours mixed up in plastic bottle caps, and when I want to use them, simply add a drop of water to re-constitute the mix. It goes on a treat over mat finishes (will not stick to gloss). It has good density, and flows really well off a fine sable brush.
the beauty of this stuff is that if you make a mistake, it is easy to wash off with water (or a damp cotton bud).
beware, this substance has very little binders, so it needs to be sealed with varnish, or over time it will lift the underlying paint right back to the plastic.
I never had any success using it as a wash, I found it left very profound tide marks. so it is great for adding detail, but stick to oil paints for wash.
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the base colours painted using goauche
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then some shadowing and highlighting
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chips and scratches using goauche