A wet room is tanked into a drain mate .what you just said you do is no good. The movement of the bath each time it's filled and emptied etc will over time cause the tanking to break away .your talking rubbish .at no point have I said a shower is not a shower if it's over a bath .you carry on being the Mr right .there is no tanking solution that sticks to bath edges
Oh for the love of god! Now you really are being stupid.
Tanking will stick to both the wall and the bath. Tanking is flexible. The tape is flexible and will move with the bath. Like silicone does.
I'm really going to try hard to put this in a way that anyone would understand. Simple......
A shower above a bath or tray will still spray water on the walls yes? Regardless of whatever is below, lets say, knee height, those walls are gonna get wet. Correct?
Without tanking, where does that water go? Over time, through the grout, into the substrate. Tank it and it will drain into the bath or on to the tray.
I truly am sorry but I can't make it any more idiot proof. If i have to get my crayons out and draw you a picture, i will do it for you tomorrow. I wouldn't do it for anyone but you are coming across as rather special and i don't understand why you're not getting it.