I have a quote to put in tomorrow,it's a bathroom with a 2.80mt2 shower cubicle,i'm going to recommend it''s tanked using mapegum. What is the coverage like for it? as it comes in different size tubs.Also can i use tubbed gear onto mapegum,although she's to get back to me on the tile sizes yet so may be bagged gear allround. Thx Paul.

Formation of surface skin: 1 hour.
Complete drying (2 mm of thickness at
+23°C): 5 hours.
Waiting time: 1-2 hours between each
coat; 12-24 days before laying ceramic.
Colour: light grey.
Application: by trowel, with a roller or by
spraying.
Storage: 24 months. Protect from frost.
Consumption
1.5 kg/m2 per mm of thickness.
Packaging
5, 10 and 25 kg drums.

try that paul..

But a membrane will be easier.... imo