I have a 21x32x1 inch kitchen sink cut-out from our marble countertop that will make a nice table for our porch. We have a left-over base that we want to attach it to and it looks to be a painted cast iron material. The thickness of the marble makes it a tad high but if necessary I could attach a thin piece of masonite to it, if that is of any help. I see a product Liquid Nails Marble that may work but it does not state it would work with metal surfaces. Any suggestions on whether this is my best bet?