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The render is about two months old. When I rub it with my hand it's quite dusty and numerous 'grains' are rubbed off. I haven't persevered to see if it is just the surface which rubs easily. It feels hard and sounds solid, though when drilled it creates a crater around the hole...a 7mm hole will...

I have rendered two small walls in my bathroom which I intend to adhere Kerdi membrane to followed by tiles, the room will be a steam shower cubicle with the kerdi providing the membrane. The render thus won't be providing any waterproofing function as it is under the kerdi. The render is...