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When applying coats of polyurea, workers need to make sure they paint on a new coat within 24 hours, or less, of the last layer, depending on the specific type of the substance being used. That ensures the polyurea layers adhere to one another and form a solid mass, blocking water from seeping through. And different methods of application can result in stronger or weaker molecular bonds. Given the renovation’s short timeline—around eight weeks—it’s possible the material wasn’t applied adequately to prevent damage. The bottom of the pool may also have been affected by the presence of heavy equipment and trucks—and a presidential motorcade that drove through at one point—while the coating was being prepared and applied.