Slurry Seals are a suspension of aggregate in an oil/water emulsion. During application a slurry is a thin liquid, although it quickly cures to form a thick, tough mat on the surface of a road. This particular installation is a type II slurry, meaning the maximum rock size is about 1/4″ (6.4mm). Curing takes between 2 to 6 hours, depending on weather conditions. The road may be opened back up to traffic after the material has finished curing.