Painted hardboard can sometimes be discolored by "wax bleed," named for the wax that is used during manufacturing to make hardboard more water-resistant. The wax can migrate to the surface, where it can change the wood's appearance.
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When uncured paint forms a skin, it can wrinkle, making the surface appear rough and crinkled paint.
A rough, crinkled paint surface, which occurs when uncured paint forms a "skin."