Contrary to M'learned friend, Bigredbat, I never stir it

I use the old trick of storing it upside down so the thick matt stuff gathers in the lid, and that's what I use for varnishing.
I've been using W&N Galeria Matt for a number of years, and it's usually pretty reliable - although it does go off a bit after a few years. Sometimes it unaccountably dries slightly shiny, but an overcoat of the thick stuff from the lid usually cures it.
It is however, also susceptible to variations in temperature, humidity, moisture etc. And this can affect how it dries.
I've found the surest way with it is to paint the Galeria varnish on fairly generously, then stick your newly varnished figures / models straight into a warm airing cupboard to dry quickly.
Once it gets old, this varnish is also prone to the occasional outbreak of white spot, where a granule of pure matting medium dries as a tiny white fleck or pimple on your otherwise pristine paintwork. You then have to pick this off and touch up.
What I've never known it to do is dry seriously shiny, nor to produce the ruinous white bloom disaster, which we've probably all experienced with spirit-based varnishes.
It's also true, BTW, that the varnish will react slightly differently to different paints on which it is overlaid. I often see this with reds and blacks, which will dry to a slightly satin finish even when the rest of the figure appears dead flat matt.
This is why some people give their figures a gloss coat first, although I've personally never bothered. It's not so much about making the figure 'tougher' and more durable. It's about providing a consistent base for the matt varnish to key onto...
Anyway... Wargamers and varnishes... The topic that will keep on giving for eternity...
