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Temperature and humidity often play a role in how the clear coat dries. Even though the plant is supposed to be a controlled environment, a slight change in the mix (thinner/reducer), a failure of an air handler or environmental control and you end up with a drying process that is little to be desired.
There are other factors such as film thickness, pressures of the fluid and air mixture at the nozzle, wait time before recoating, etc.
A slight orange peel is considered to be commercially or industrially acceptable.
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