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However, back in the day, I used to use Maimeri gouache acrylics for figure painting.
I have a dropper bottle with a mix of water (80%) and flow improver (20%). each time I use GW type pots, before closing the jar, I add in two drops of my mix and shake, it keeps the content really mobile. Every now and then, I go through all the Vallejo bottles and do the same.
Interesting option I hadn't considered! Gouache is not actually an acrylic, though. It uses gum arabic as a binder and can be re-wet like a watercolor. Do you seal your figures with a varnish?
Gouache is just a term for an opaque, rather than transparent, type of watercolour paint, also known as body colour. If the binder is gum arabic (the traditional binder) then it's not an acrylic and can be reactivated with water. If the binder is acrylic then it's acrylic, but it's still gouache if it's used in the manner of gouache.I do tend to seal it in any case, if the figures are going to be handled much, but mainly because the surface is very, very matte and tends to pick up finger oils easily.
Fitz, gouache is indeed nicely matt. I have never used it on models an minis, eventhough I now remember reading the great Shephard Payne using it on his 1/35s in his poorer student days (I used to slavishly follow his advice). But I suppose that desirable guache quality advantage to a ordinary is rather rather diminished after a coat of varnish. So do you use gouache only with display objects?