What property describes the thickness or flow rate of liquid paint?

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Viscosity is the property that describes the thickness or flow rate of liquid paint. It tells you how thick the paint is and how easily it flows when you apply it. A higher viscosity means a thicker paint that resists flow, which can lead to issues like poor leveling, sagging, or requiring more thinning or a different spray setup. A lower viscosity allows the paint to flow and level more readily, aiding atomization and smooth film formation, but if it’s too thin, you can get runs or insufficient coverage. For automotive refinishing, adjusting viscosity helps you match the reducer, spray gun, nozzle size, and application conditions to achieve a consistent film thickness. Flow-out is about how the coating levels after it's laid down, not the initial flow rate; sheen is about gloss, and color intensity relates to pigment concentration.