Reply To: Does matt Varnish go off? – Airbrush always getting blocked

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Evaporation can be an issue and tossing in some flow improver might help but your nozzle size is a better bet to work on. Considering that matte varnish is just gloss varnish with added talc precipitate added to give it a frosty look it is more likely the culprit for clogs. The dry tip problem with airbrush is easily addressed with a touch of glycerin for your acrylics but some mineral spirits would be the material for lacquer and enamel type paints. I haven’t used Vallejo varnish myself but that could be a consideration.