DAP Bondex Flexible Floor Gray Patch & Leveler 1 gal. (Pack of 4)If you are on the lookout for a quick setting floor leveler, you should opt for the Bondex Flexible Floor Patch and Leveler from DAP. A floor patch or leveler can help smooth out any rough areas if your concrete, cement, or other substrate is uneven. The DAP flexible floor patch and leveler is a ready to use latex based product that is ideal for filling cracks and knotholes and will level out the low areas in plywood subfloors or concrete surfaces.