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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.]]> http://www.dakkadakka.com/dakkaforum/posts/preList/499242/5156485.page http://www.dakkadakka.com/dakkaforum/posts/preList/499242/5156485.page GMT GW paint on varnish, I tend to only add enough water to break the brushmarks, if its too thin it's not really going to do anything.]]> http://www.dakkadakka.com/dakkaforum/posts/preList/499242/5158688.page http://www.dakkadakka.com/dakkaforum/posts/preList/499242/5158688.page GMT