I have a 9 yr old pebbletec pool without any waterline tile. I think the lack of tile make the pool look unfinished and white calcium deposits at the waterline have built up further detracting from the appearance. I've been told by two pool tile installers and by Pebbletec themselves that tile should not be installed over Pebbletec although none have had actual experience doing it. They propose chipping out the Pebbletec and then installing tile. Has anyone tried putting tile over it?