Yes but the most important thing is cleaning up the oil and grease from the floor, I would take some 'oil dry' granules and a flat piece of cement block and grind the granules into the floor where the oil stains are. Wash down with soap and water and let dry, a leaf blower helps. If water beads up on the concrete the epoxy will not stick.I guess your talking as a pre paint step? I pretty much live at the Lowdepot, so what’s one more run!!