Which statement best describes the curing window for epoxy primer before sanding or topcoat?

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Epoxy primer has a specific working window that is defined by the product you’re using and the conditions in the shop. For sanding or applying the next coat, you must follow the time stated on the product label, because the allowable window depends on the particular primer and the ambient temperature and humidity. In many products, this window is a short period at room temperature, often around 30–60 minutes, but some formulations require longer or shorter times; always follow what the label says. If you sand or topcoat too early, you can clog sanding surfaces or weaken the bond; if you wait too long and the primer fully cures, the surface may not take subsequent coats properly. This is why the best practice is to wait the labeled time and adjust for your environment as specified.