Which of the following is NOT listed as a factor influencing cure times for spray-applied fireproofing?

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The factors that determine how quickly spray-applied fireproofing cures are tied to the material's chemistry and the surrounding conditions, not cosmetic aspects of the surface. The material type dictates the curing mechanism and intrinsic drying/setting time (cementitious vs intumescent blends have different cure profiles). Ambient temperature speeds up or slows down curing, with higher temperatures typically promoting faster cure and lower temperatures slowing it. Humidity affects moisture loss and drying, influencing how quickly the coating reaches its final set. The color of the substrate doesn’t influence the curing chemistry or moisture interaction in standard guidelines, so it’s not considered a factor in cure time. That’s why the color of the substrate is the correct choice.