I have a new (6 months) infinity edge salt water pool, gunite/ plaster with plaster on the spillover wall. A spa waterfall is on a timer about 6 hours a day, which keeps water flowing over the spillover. The pool builder (experienced) said we should leave this spillover wall as plaster, but others have since told me it will deteriorate too quickly, and I should tile it. The pool builder says "no", and especially says no to epoxy paint. So ... mixed messages. To tile, or not to tile? (I have a lot of 18 inch porcelain tile in hand). Advice?