Starting with a ratio of paint-to-thinner of 1:3 allows you to experiment with your airbrush. The proper viscosity or thickness of paint you’ll need for airbrushing miniatures depends on the size of your airbrush nozzle, working air pressure, and the detail you need to airbrush. “Hard water” contains minerals that can lead to an undesirable chemical reaction with some art mediums and paints, or react with the metal inside your airbrush, which can form hard-to-clean mineral deposits. “Soft water” is water that contains little or no dissolved minerals, such as calcium. Note that you’ll want to use “soft” water rather than “hard” water for thinning hobby acrylics. This is because almost all hobby paints are water-based mediums, and therefore dissolve easily in water (a solvent). How do you thin acrylic paints for painting miniatures with an airbrush? The best way to thin hobby acrylic paints for an airbrush is to use water. Best Way to Thin Acrylic Paints for Airbrushes But, again, smaller nozzles are prone to clogging if you try to spray thicker paints and will require higher air pressure, which reduces your control. If you’re planning to airbrush very thinned paints or inks and washes, a smaller nozzle size will help. The nose and nozzle assembly are delicate parts on any airbrush.
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