HOLES: Repair with hydraulic cement. We recommend use “Rapid Set” products
CRACKS & CONTROL JOINTS: Repair and fill them with an appropriated epoxy filler.
CONTRUCTION JOINTS & COLD JOINTS: Must be honored. We recommend use appropriate metal divider.
Grind the concrete floor with metal diamond #30/40 to clean the surface for any residual as well as glue, paint, thin set.
Vacuum and clean with alcohol.
For surfaces that require leveling or extensive repair more than 1/4” thickness, we recommend to use self-leveling ULTRAPLAN PLUS 1 underlayment or similar for interior floors. And for exterior floor MAPECEM 102 or similar. Read specs for the right priming, mixing and installation