The Ship Model Forum

At an art supply store you can buy this stuff called "polymer varnish" which is essentially clear acrylic with slightly different properties that enable it to be easily thinned with tap water for spraying. It produces a really pretty matte, gloss, or satin final varnish or pre-weathering/decaling gloss. It has built-in UV filters which will also protect your model from fading/discolouring.
2 parts varnish-1part water and you're good to go with your airbrush.
Very even and invisible spraying. Water-based, but seems to adhere to any kind of surface. The matte is the mattest finish I've ever seen.

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Every time the PE sticks to your tweezers, you lose a minute off your life.

Nice tip. Thanks!

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We like our history sanitized and theme-parked and self-congratulatory, not bloody and angry and unflattering. - Jonathan Yardley

Just wanted to say that I used this stuff on the USS Benson I just finished. Wonderful stuff, my new clear coats. Works beautifully, thinned with water and applied with airbrush.

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We like our history sanitized and theme-parked and self-congratulatory, not bloody and angry and unflattering. - Jonathan Yardley