Hi all, new here. Just bought Quikrete Waterproofing Sealer*. I have a 9x4x4 ft pond containing a pvc liner underlayment under a 4inch cement thickness on all sides. The cement used was Quikrete Crack Resistant* brand. (Extra info: I live in Houston, TX) Would this sealer be adequate in retaining water for the pond? Image attached. Any response is appreciated!