Amazon.com: The Army Painter Anti Shine Matt Varnish for Miniature Painting - After Quickshade Matte Top Coat Acrylic Varnish for Miniatures - Matte Finish for Acrylic Model Paint, 18ml, Dropper Bottle :
How to Fix Matt Varnish Clouding - YouTube
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Quick Tip - The (almost) Complete Miniature Painter's Guide to Brush On Varnishing - YouTube