Best Overall: Sika Sikaflex Pro Select Self-Leveling Sealant Fill cracks up to 1.5 inches wide with this self-leveling, flexible, paintable sealer that is also waterproof once dry.

I used Quikrete Self-Leveling Floor Resurfacer concrete mix and poured a skim coat over the top of the existing concrete floors. I did NOT get this right the first time so I hope you learn from my ...