The maximum depth for a single layer of TotalBoat Fathom epoxy, when used for a slab pour, river table, live edge slabs, or other larger surface area pours is 2". Pouring Fathom deeper than this in a single pour may lead to cracking, excessive shrinkage, yellowing, or a distorted surface. When doing step pours, wait at least 36 hours for the previous layer to cure before applying another layer of Fathom.