You cannot see it, but I used what little tape I had left to cover the edge. I also tanked this area of seat edge with an extra coat of tanking. The top of the seat is also being tiled out on top of the tiles going down in a slight gradient so the flow of water should fall of without sitting on it.
Yes with the shower tray being a little higher, that was planned as I don't actually like wet rooms, so the shower screen is going to come down the wall over the shelf edge by about 1 inch then down the side and sit on top of the shower tray then return to the wall with a door section. So the bath side is actually out of the wet zone.
I hope the alcove works too lol, my concentration hen setting out was to finish as close to the ceiling as possible without cuts, incorporating the tray, seat and bath edges. Spent a day setting out .
I actually ended up putting an extra 5mm tile backer board around the seat and bath top to raise it up to compensate setting out so it works well now and I also tanked this again. So I have 4 le els of ranking on seat and 2 tile boards lol.