The overcoat time for TotalBoat Gelcoat is dependent on a couple factors. For any gelcoat, the overcoat time is dependent on the amount of MEKP and environmental conditions. Gelcoat with wax, or any other airdry additive that has cured hard and tack-free must have the wax removed from the surface, and sanded prior to reapplying. Otherwise, gelcoat that is still tacky can be directly overcoat, regardless if it has wax/airdry or not.