How To Sand Concrete Patch. Once you have laid out your sections, you can start sanding, preferably with a space in the corner of the room. Tamp the concrete patch mix tightly into the undercut area.
Work methodically across the length and width of the room. Top n' bond by sakrete is a polymer modified repair mortar used for patching, repairing and resurfacing cracked or chipped concrete surfaces. Start by making sure that the surface is clear of any external elements.