Hello, I had a new shower tray fitted after tiles started coming off wall. One of the p'board walls came away so cement backer board was installed there. The plumber installed the tray with all the protective film over it, he said ready for the tiler. Only thing is he siliconed the film to the walls instead of the shower tray to the walls. Before the tiler arrives do I need to get that silicone off along with as much of the film as I can - the walls are built onto the tray so I won't be able to remove film completely off edges? I know the tiler applies silicone after tiling but I'm pretty sure the tray should be sealed to walls before tiling. Please help! Am scared the water will get through again and I'll end up having to get new walls and tiles put up for the third time.