The correlation between the state of cure of an unsaturated polyester coating and its resistance to ethanol at room temperature is studied. The heat generated by the remainder of the cure reaction at a given time as a fraction of the total heat generated is called the state of cure. Sheets with various states of cure ranging from 75 to 95% were prepared and put in contact with an ethanolic solution at 95% ethanol. The process of ethanol absorption is controlled by transient diffusion with a constant diffusivity. A statement is obtained: the higher the state of cure, the lower the amount of ethanol absorbed and the lower the diffusivity.
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