A - Under certain conditions, normally on a hot, extremely muggy day, the solvent vapor that evaporates from the coating may lock onto water molecules in the air and actually drop back to the floor. This can result in improper curing of the coating due to extended tackiness. In extreme cases, puddles of solvent have actually formed on the floor. To prevent this from happening, turn on the exhaust system two to four hours after each application of solventbased seal, paint, or finish. If the exhaust system is inadequate to pull a significant amount of air out of the facility, or if an exhaust system does not exist, we recommend setting a large, box fan at an entrance to the facility. Set the fan so it exhausts the air out of the facility.