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Well, you can always add another coat. As thin as the layers you're putting on are, you should have plenty of warning before the buildup gets thick enough to affect the look. If anything, I think your mix might be a bit thin, requiring layer after layer to actually build up some decent protection.
I treat brush-on varnish just like paint - if the goal is protection, I want smooth, heavy coverage, like when basecoating. For that, I thin as little as necessary to achieve good flow off the brush and an even finish. If I'm just after the luster (e.g. glossing select areas after an overall matte spray), I'll thin it quite heavily, as I would when glazing. One must be careful to avoid the same hazards, though - overly thin mixes will try to pool and run into crevices if you overload your brush, etc.
Hard to suggest a ratio, as consistency varies from varnish to varnish, just like it does with paints. My Vallejo gloss takes very little thinning to start flowing well, while my Liquitex matte is much thicker out of the bottle - I'd need to add two or even three parts water to get the Liquitex to behave like a 1:1 mix of Vallejo.
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