![]() ![]() What works on a cool, dry day is different from what works in warm, wet weather. Unfortunately, you can’t just find a ratio of product to thinner that works once, and stick with it for the rest of your woodworking life. In order to apply one of these products with a sprayer, for instance, you must thin it to a viscosity that will easily travel through the hose, nozzle, and spray tip, without clogging. It is essential when applying these materials with a spraying device. Knowing the viscosity of your paint, stain, or wood finish is helpful anytime you’re operating outside of the ideal temperature conditions. To find out exactly how viscous a substance is, use a viscosity cup. High internal friction makes the molecules harder to separate, resulting in slower pour times than water, and more difficulty spreading the material. Household paint, on the other hand, can be highly viscous. Water has low internal friction, and therefore, low viscosity. Water molecules easily slip past each other, making it easy to pour or spread. It describes how much internal friction there is at a molecular level. Viscosity, simply put, is a measurement of how much or how little a given fluid ‘flows’.
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