This short post is really an update to this post from 2009.
I have in the past used Galleria Matt Varnish as my preferred matt surface on miniatures and terrain. I have found that mixing Galleria Matt Varnish with some Tamiya Flat Base X-21 gave a very matt finish. However a recent article in this months Airfix Model World has led to this update.....
The seven page article on constructing and painting a Griffon engined Spitfire FR Mk.XIVe suggests mixing Winsor & Newton Galleria Acrylic Matt Varnish with isopropyl alcohol for airbrushing and I thought it was worth passing on.
I have not yet tried this technique/mix and would suggest that anyone wanting to experiment uses a test piece first.