ORIGINAL: wyowindworks
Each coat of surface coat is a new batch. I often use a fast hardener for the surface coats.

A flowing coat of PVA is one in which all the atomized droplets come together and form a smooth, flat, glossy finish. When a flowing coat first gets sprayed on it will look milky. As it sits, the little air bubbles will escape and it will look clear. Typically an airbrush does a pour job of spraying a nice smooth finish because the nozzle is too small to let enough product out of the gun. I like to spray with a 1.4 mm tip.

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