The waiting time to recoat TotalBoat FlexEpox flexible epoxy adhesive, without having to sand first, depends on how thick you apply the epoxy and on the ambient temperature. For recoating, wait about 1-3 hours until the FlexEpox has started to firm up, but is still tacky enough to form a strong chemical bond with the next coat of FlexEpox.
If the FlexEpox coating is hard and no longer tacky, wash the surface with a mild soap and warm water, sand the surface, remove sanding residue, then apply another layer of FlexEpox.