Given proper conditions (air temp, surface temp, sunlight exposure, wind, humidity, etc) many new sealcoat applications dry quickly and can be open to low to medium traffic within hours. If ideal conditions are not meant or the sealcoat will be subject to higher traffic volumes (e.g. main entrances to large communities or complexes) or tight turning from parking ingress/egress (as in shopping center parking lots) it may be desirable for the sealcoat to cure overnight before it is open to traffic again.