Describe the function of “in-flight loss of solvent” when transporting a reduced finish from the paint gun to the target object.
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In-flight loss of solvent is, as the name implies, the portion of the solvent which is designed to both reduce the paint's viscosity and evaporate “in flight,” or between the time it leaves the gun and when it hits the object being finished. Refinish guns are external mix: the paint mixes with air outside the gun, both to propel the finish to the vehicle and to atomize the finish. Though some air is used to cause a vacuum and transport the finish from the cup to the air cap of the gun, this air only minimally aids in the atomization.
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